By Fineo VIG|2025-09-24T14:24:00+00:00September 24th, 2025|News|

How to Make Windows More Energy Efficient

Making your windows more energy efficient can dramatically improve comfort, reduce draughts, and cut heat loss by up to a third. Whether you’re dealing with ageing sash windows in a period home or considering upgrades for a modern property, there are practical solutions — from simple DIY fixes to advanced glazing technologies — that can transform how your home retains heat.

As someone who has worked with both heritage properties and modern glazing systems, I’ve seen how the right approach to window efficiency can make a huge difference. The good news is that in Ireland, there are now more options than ever to improve performance while preserving the look and character of your home.

Understanding Window Energy Efficiency Standards in Ireland

In Ireland, Building Regulations Part L set minimum standards for window performance. These are measured using the U-value (how much heat passes through a window). The lower the U-value, the better the insulation.

Single glazing: typically has a U-value around 5.8 W/m²K (very poor performance).
Modern double glazing: often achieves U-values around 1.2 W/m²K.
High-performance glazing (triple or vacuum): can go as low as 0.7 W/m²K.

It’s also important to consider solar gain (how much free heat from the sun comes through) and air leakage. The right balance depends on your home’s orientation and design — for example, south-facing windows benefit from maximising solar gain, while north-facing windows prioritise insulation.

What Types of Energy-Efficient Glazing Should You Consider?

Double glazing: The standard for most homes, using an insulating air or gas layer between panes to reduce heat loss.
Triple glazing: Offers even lower U-values but comes with extra weight, which can be challenging for older frames.
Low-emissivity (Low-E) coatings: Thin metallic layers that reflect heat back indoors while still allowing light in.
Vacuum glazing: A newer technology that outperforms triple glazing while being as slim as single glass — ideal for heritage properties where frame sizes can’t be altered.

How Do Window Frame Materials Impact Energy Efficiency?

uPVC: Popular for its excellent insulation and low maintenance.
Aluminium: Strong and durable but must include thermal breaks to prevent heat transfer.
Timber: Naturally insulating and often the only option for conservation projects.
Composite: Combines timber cores with protective uPVC or aluminium exteriors for durability and performance.

Should You Upgrade or Replace Your Windows?

If your frames are in good condition, upgrading the glazing can deliver most of the benefits without full replacement. Options include:

Reglazing: Fitting modern high-performance units into existing frames.
Secondary glazing: Installing an extra pane on the inside of the window to create an insulating gap — particularly useful for listed or protected structures.
Full replacement: Recommended when frames are damaged, warped, or beyond repair.

Simple DIY Methods to Improve Window Efficiency

Not every improvement needs to involve major works. Smaller steps can also make a big difference:

Weather stripping: Seals gaps around window frames to stop draughts.
Window insulation film: Creates an extra layer of trapped air for better thermal performance.
Thermal curtains or blinds: Trap heat in and reduce cold spots near windows.
Draught excluders: Particularly effective for sash windows.

SEAI Grants and Financial Support in Ireland

Homeowners in Ireland can access support through the Sustainable Energy Authority of Ireland (SEAI). Grants are available under the SEAI Home Energy Grants and the One Stop Shop Service.

These schemes can help cover the cost of window and door upgrades as part of a whole-house energy improvement plan. Key benefits include:

Grants towards window and door replacements when included in a full retrofit project.
Access to expert contractors approved by SEAI.
The opportunity to combine window upgrades with insulation, heat pumps, and solar PV for maximum efficiency.

For homeowners who want to reduce energy use and improve comfort, these schemes make energy-efficient glazing more accessible and affordable.

Professional Installation vs DIY

While some improvements are easy to tackle yourself, full window upgrades are best left to certified professionals. Correct installation ensures compliance with Irish Building Regulations, avoids problems like water ingress, and maximises performance.

For smaller upgrades — such as thermal blinds, weather stripping, or secondary glazing kits — confident DIYers can make noticeable improvements without specialist help.

Frequently Asked Questions

What’s the easiest way to improve window efficiency in a rental property?
Removable options work best. Secondary glazing panels, thermal blinds, and draught excluders can all help without making permanent changes.

How do I know if my double glazing has failed?
Look for condensation between the panes, misting, or a hazy appearance. These signs mean the seal has failed and the unit needs replacing.

Can vacuum glazing be fitted into older sash windows?
Yes. Because it’s ultra-thin, vacuum glazing can fit into traditional frames, making it a strong option for heritage or conservation properties.

Should I prioritise windows or wall insulation?
Both are important, but improving windows often delivers immediate comfort gains by eliminating draughts and cold spots near glass surfaces.

Conclusion

Improving the energy efficiency of your windows doesn’t have to be an all-or-nothing project. From simple draught-proofing to advanced glazing, there are solutions for every home.

With the support of SEAI grants and the One Stop Shop Service, Irish homeowners now have more opportunities than ever to improve comfort, cut heat loss, and future-proof their homes.

Why not start with a simple draught test this weekend? Even small steps can make a big difference — and if you’re ready for a full upgrade, Ireland’s retrofit supports make the path clearer than ever.

Is It Worth Replacing – Double Glazing Vs Triple Glazing?
Is It Worth Replacing – Double Glazing Vs Triple Glazing?

Is It Worth Replacing – Double Glazing Vs Triple Glazing?

By Fineo VIG|2025-09-24T14:12:00+00:00September 24th, 2025|News|

Is It Worth Replacing – Double Glazing Vs Triple Glazing?

If you’re contemplating whether to upgrade from double to triple glazing, the short answer is: it depends on your specific circumstances, property type, and long-term objectives. While triple glazing offers approximately 50% better thermal performance than double glazing, the financial and practical implications require careful consideration.

As a homeowner with double glazing that’s perhaps showing its age, you’re likely wondering whether the investment in triple glazing will genuinely deliver the promised benefits. Let me walk you through the complete picture, including some alternatives you might not have considered.

Understanding the Performance Gap Between Double and Triple Glazing

The fundamental difference between double and triple glazing lies in their construction and resulting thermal performance. Double glazing consists of two panes of glass with a single gas-filled cavity, typically achieving U-values around 1.6 W/m²K. Triple glazing adds a third pane and second cavity, reducing U-values to approximately 0.8 W/m²K.

What does this mean in practical terms? A lower U-value indicates better insulation – heat escapes more slowly through your windows. To put this in perspective, Irish homes lose between 10% and 40% of their heat through windows and doors. With our homes losing heat three times faster than their European counterparts, this performance difference becomes particularly significant.

However, here’s what many articles won’t tell you: the cavity size between panes matters enormously. Some manufacturers squeeze three panes into barely more space than traditional double glazing uses. As Denis Hussein notes from his extensive experience, “Triple glazing is only worth it if the spacing is ≥ 16mm between sheets of glass.” Without adequate spacing, you’re essentially paying premium prices for marginal improvements.

Insert image of cross-section comparison between double and triple glazing units here

Installation Challenges Most Articles Won’t Discuss

Here’s something crucial that’s often glossed over: triple glazing units are up to 50% heavier than double glazing. This isn’t just a minor detail – it’s a game-changer for installation complexity and cost.

Denis Hussein’s experience reveals the reality: “This increased bulk necessitates deeper window frame profiles to accommodate the thicker glass units. Consequently, for properties with older or non-standard frames, this almost invariably leads to the complete replacement of existing frames.”

What does this mean for you? If your home has original timber frames or you live in a conservation area, you’re not just replacing glass – you’re potentially facing:

Complete frame replacement rather than simple glazing unit substitution
Structural reinforcement to support the additional weight
Deeper reveals that reduce natural light and alter your property’s character
Potential loss of interior space due to thicker frames
Extended installation timeframes (up to three days versus a few hours)

For heritage properties, these modifications might not even be permitted. Listed buildings and conservation areas often have strict regulations about maintaining original window profiles and aesthetics.

Regional Climate Considerations: Does Location Matter?

Your location within Ireland significantly impacts whether triple glazing makes financial sense. Properties on the west and north coast, where heating demands are substantially higher, will see more immediate benefits from superior insulation.

In colder regions, the enhanced thermal performance translates directly into greater energy savings and shorter payback periods. The comfort benefits – elimination of draughts, cold spots, and condensation – become particularly noticeable during harsh winters.

Conversely, if you’re in the milder South, while you’ll still enjoy improved comfort, the financial payback takes considerably longer. However, as Denis Hussein emphasizes, with quality glazing solutions offering lifespans exceeding 60 years, even modest annual savings accumulate substantially over time.

Environmental Impact: The Hidden Carbon Cost

For environmentally conscious homeowners, there’s an uncomfortable truth about triple glazing: manufacturing it produces 40-50% more embodied carbon than double glazing. This stems from the energy-intensive production of noble gases for the cavities and the environmental cost of transporting heavier units.

While operational energy savings eventually offset this initial carbon debt, the payback period extends beyond simple financial calculations. You’re looking at years before the reduced heating emissions compensate for the manufacturing impact.

This raises an important question: are there alternatives that deliver comparable performance without the environmental burden?

The Game-Changing Alternative: Vacuum Glazing Technology

This is where vacuum glazing technology enters the conversation. Products like Fineo achieve U-values of 0.7 W/m²K – actually better than triple glazing – while being only 7.7mm thick.

Why does this matter? Because vacuum glazing can be retrofitted into existing frames, including original timber sashes. No structural modifications, no lost interior space, no compromise on aesthetics. For heritage properties, this represents a revolution in energy efficiency possibilities.

The environmental credentials are equally impressive. Vacuum glazing eliminates the need for gas fills, is 100% recyclable, and with European manufacturing, carries a significantly lower carbon footprint than imported triple glazing units.

Making the Right Decision for Your Property

So, is it worth replacing double glazing with triple glazing? The answer depends on several factors:

Consider triple glazing if:

You’re building new or completely replacing window frames anyway
You live in a particularly cold region with high heating demands
Your existing double glazing pre-dates 2002
You plan to stay in your property long-term (20+ years)
Future-proofing against regulations is a priority

Think twice if:

Your current frames can’t support the additional weight
You live in a conservation area or listed building
Your double glazing is relatively modern (post-2010)
The payback period exceeds your expected time in the property

Consider vacuum glazing if:

You want triple glazing performance without frame replacement
Maintaining original window aesthetics is crucial
Environmental impact is a primary concern
You need a solution for heritage properties

Technical Considerations for Modern Homes

If you’re running a smart home with advanced heating controls, upgrading to triple glazing creates an interesting dynamic. The significantly improved airtightness means you’ll need to reconsider your ventilation strategy.

As Denis Hussein explains, “While triple glazing offers superior thermal insulation and eliminates drafts, this enhanced sealing means natural air movement is inhibited.” You might need to invest in mechanical ventilation with heat recovery (MVHR) to maintain air quality – an additional cost rarely mentioned in promotional materials.

Your existing heating system may also require recalibration. With substantially reduced heat loss, you might find your current boiler oversized, leading to inefficient cycling. Factor in potential heating system adjustments when budgeting for your upgrade.

The Quality Question: Not All Triple Glazing Is Equal

Here’s a critical point: poorly manufactured triple glazing can actually perform worse than quality double glazing. Recent studies show that thin triple glazing units with inadequate cavity spacing deliver only marginal improvements over double glazing.

When evaluating options, focus on:

Cavity spacing (minimum 16mm, ideally 20mm)
Gas fill quality (argon or krypton)
Low-E coatings on appropriate surfaces
Frame thermal performance
Manufacturer warranties and expected lifespan

Remember, the most expensive option isn’t automatically the best. A well-designed double glazing system might outperform budget triple glazing.

FAQ: Your Triple Glazing Questions Answered

Can I simply replace the glass units in my existing double glazed frames with triple glazing?

Unfortunately, no. Triple glazed units require deeper rebates and stronger frames to support their additional weight and thickness. The sealed unit cannot be removed without destroying the frame integrity, necessitating complete window replacement in most cases.

How much quieter is triple glazing compared to double glazing?

Triple glazing typically achieves sound reduction ratings of 32 dB compared to 31 dB for double glazing – a marginal improvement. However, vacuum glazing like Fineo achieves 35 dB reduction, offering superior acoustic performance despite its slimmer profile.

Will triple glazing eliminate condensation completely?

While triple glazing significantly reduces internal condensation due to warmer inner pane temperatures, it cannot eliminate it entirely. High indoor humidity or poor ventilation can still cause moisture buildup. Adequate ventilation remains essential regardless of glazing type.

Do I need planning permission to upgrade to triple glazing?

For most properties, no. However, if you live in a conservation area, own a listed building, or have an Article 4 Direction on your property, you’ll need permission. The thicker frames of triple glazing often alter window proportions enough to require consent.

What happens if the seal fails on triple glazing?

Seal failure in triple glazing is particularly problematic as you have two cavities that can fog up. Unlike double glazing, repair isn’t economically viable – the entire unit requires replacement. Quality manufacturers offer 20-25 year warranties, but ensure you understand what’s covered.

Conclusion: Making an Informed Choice

Replacing double glazing with triple glazing isn’t a simple yes-or-no decision. While triple glazing offers superior thermal performance, the practical and financial implications vary dramatically based on your specific circumstances.

For many Irish homeowners, particularly those in heritage properties or with modern double glazing, the case for triple glazing remains marginal. The combination of high upfront costs, installation complexity, and extended payback periods challenges the value proposition.

However, innovative alternatives like vacuum glazing technology offer a compelling middle ground – delivering comparable or superior performance without the installation headaches or aesthetic compromises.

Before making your decision, get detailed quotes, understand your property’s specific requirements, and consider your long-term plans. And remember, sometimes the best upgrade isn’t the most obvious one. If you’re looking for triple glazing performance in a heritage-friendly package, it might be time to explore vacuum glazing solutions that preserve your property’s character while delivering 21st-century efficiency.

Contact the Fineo team below

Types of Energy Efficient Windows
Types of Energy Efficient Windows

Types of Energy Efficient Windows

By Fineo VIG|2025-09-24T13:54:07+00:00September 24th, 2025|News|

Types of Energy Efficient Windows: Which One Is Right for Your Home?

Energy efficiency has become one of the most important considerations for Irish homeowners when upgrading their properties. Rising energy bills, stricter building regulations, and the urgent need to reduce carbon emissions have made high-performance windows less of a luxury and more of a necessity. Yet, with so many options available — from standard double glazing to advanced vacuum insulated glass — the landscape can feel confusing.

If you’ve ever wondered which type of window really makes the difference, this guide is for you. We’ll walk you through the different types of energy efficient windows, compare how they perform in Irish weather conditions, and show you why vacuum glazing is increasingly recognised as the next step in sustainable window technology.

Why Energy Efficient Windows Matter

Windows are more than just a way to bring in light and connect us to the outdoors. They’re also one of the biggest sources of heat loss in a home. According to the Energy Saving Trust, poorly performing windows can account for up to 20% of a property’s energy loss.

Efficient windows improve thermal comfort, reduce condensation, and cut down on external noise — but the biggest impact is financial. Lower heat loss means less energy consumed, which directly translates into smaller energy bills. With the government targeting net-zero by 2050, energy efficient glazing also helps future-proof your home against tightening regulations.

The Main Types of Energy Efficient Windows

Single Glazing (The Starting Point)

Single glazing is the traditional form of glazing you’ll still find in many period and heritage homes. Consisting of just one sheet of glass, it has virtually no insulating properties. Heat escapes easily, cold draughts come in, and condensation is common.

While single glazing can look beautiful in heritage timber frames, it is also the least efficient option — with a typical U-value (a measure of heat transfer) of around 5.8 W/m²K. For context, modern building standards require windows to achieve at least 1.6 W/m²K or lower.

Standard Double Glazing

Double glazing has been the standard since the 1980s. Two panes of glass are separated by a 20mm cavity, filled with argon or krypton gas. These gases are denser than air, slowing down heat transfer.

Typical performance:

U-value:2 – 1.5 W/m²K
Noise reduction: ~30–32 dB
Lifespan: 10–15 years (gas leakage through porous seals is common)

Double glazing dramatically outperforms single glass, but it has limitations. The bulky frames required make it unsuitable for listed buildings, and over time, the insulating gases escape, reducing efficiency.

Triple Glazing

Triple glazing builds on the double glazed concept with a third pane of glass and two cavities filled with gas. It can achieve U-values as low as 0.8 W/m²K and is increasingly used in new-builds to meet stringent Part L regulations.

Typical performance:

U-value:8 – 1.0 W/m²K
Noise reduction: ~34–36 dB
Lifespan: 15–20 years

While efficient, triple glazing comes with trade-offs. Units are heavy, putting strain on frames and walls, and thicker profiles reduce the amount of natural light coming into a room. For heritage properties, it is rarely permitted due to visual impact.

Slimline Double Glazing

Slimline units were designed specifically for heritage homes and conservation areas. These use thinner panes and narrower cavities filled with inert gas to mimic the appearance of single glazing while offering modest thermal improvements.

Typical performance:

U-value:9 – 2.4 W/m²K
Noise reduction: ~28–32 dB
Lifespan: 5–10 years (slim seals often fail early)

The issue is durability. By slimming down seals and cavities, slimline units are prone to moisture ingress and early gas loss. Many homeowners have experienced failure within a decade.

Secondary Glazing

Secondary glazing involves adding a discreet internal pane behind an existing single-glazed window. It is often used in listed buildings where replacing original glass isn’t allowed.

Performance varies depending on the gap created between panes, but it typically reduces draughts and noise rather than significantly boosting insulation.

Typical performance:

U-value:8 – 2.0 W/m²K
Noise reduction: 35–40 dB
Lifespan: 15+ years (depending on framing system)

While useful as a stopgap, secondary glazing can be visually intrusive inside the home and doesn’t solve the underlying inefficiency of the original window.

Vacuum Glazing (Fineo: The Next Generation)

Vacuum glazing is the most advanced technology currently available. Instead of filling a cavity with gas, it removes all air entirely, creating a vacuum between two thin panes of glass. Because heat and sound cannot travel through a vacuum, performance is exceptional — even though the cavity is less than half a millimetre thick.

Typical performance:

U-value:4 – 0.7 W/m²K (better than triple glazing)
Noise reduction: 36–39 dB
Thickness: Just 6–8 mm (similar to single glazing)
Lifespan: 60+ years (with a 20-year Fineo warranty)

Fineo vacuum glazing, manufactured in Belgium by AGC, combines the elegance of single glazing with the performance of triple glazing. Because it’s so thin and lightweight, it can be retrofitted directly into existing timber or steel frames, making it ideal for heritage homes and listed buildings.

From the outside, vacuum glazing looks identical to traditional glass, but inside the home it transforms comfort — eliminating draughts, reducing heating bills, and blocking external noise.

Comparing the Options

Window Type	U-Value (W/m²K)	Noise Reduction (dB)	Thickness	Lifespan	Suitability
Single Glazing	~5.8	20–25	3–4 mm	50+ yrs	Heritage, but inefficient
Slimline Double	1.9–2.4	28–32	10–12 mm	5–10 yrs	Heritage retrofits, short lifespan
Standard Double	1.2–1.5	30–32	24–28 mm	10–15 yrs	Modern homes
Triple Glazing	0.8–1.0	34–36	36–44 mm	15–20 yrs	New builds, high efficiency
Secondary Glazing	1.8–2.0	35–40	Varies	15+ yrs	Listed buildings
Vacuum Glazing	0.4–0.7	36–39	6–8 mm	60+ yrs	Heritage, modern, listed, passive homes

Environmental Impact

When evaluating energy efficient windows, it’s not just about performance but also sustainability.

Double & Triple Glazing: Require energy-intensive noble gases like argon or krypton. Over time, gases leak, reducing efficiency and necessitating replacement.
Slimline Glazing: Short lifespan means frequent replacements, creating waste.
Vacuum Glazing (Fineo): Contains no gases, is 100% recyclable, and is manufactured locally in Belgium using low-carbon energy and on-site solar. With an expected lifespan of 60 years, Fineo reduces both manufacturing impact and long-term waste.

Why Vacuum Glazing Stands Out

Vacuum glazing isn’t just another option — it represents a leap forward in window technology. For heritage property owners, it is often the only solution that meets planning requirements without compromising aesthetics. For modern homeowners, it’s a future-proof investment that outperforms current regulations and delivers long-term cost savings.

Yes, the upfront cost is higher than standard double glazing. But when you factor in energy savings, reduced maintenance, and the fact you may never need to replace them in your lifetime, vacuum glazing often works out as the most economical choice in the long run.

FAQs: Types of Energy Efficient Windows

What type of window is best for listed buildings?
Vacuum glazing is widely considered the best option for listed buildings because it matches the appearance of single glazing while delivering superior thermal performance. Fineo vacuum glazing is only 7.7mm thick, making it acceptable to conservation officers.

Is triple glazing always better than double glazing?
Triple glazing provides lower U-values than double glazing, but it is thicker, heavier, and often unnecessary in the milder Irish climate. Vacuum glazing achieves even better insulation without the drawbacks.

How long does energy efficient glazing last?
Standard double glazing typically lasts 10–15 years before seals fail. Slimline glazing can fail within 5–10 years. Triple glazing can reach 20 years. Fineo vacuum glazing, however, carries a 20-year warranty and has a lifespan of over 60 years.

Can vacuum glazing be used in modern homes as well as heritage ones?
Absolutely. While perfect for heritage applications, vacuum glazing is also ideal for modern homes. Its U-values already exceed the upcoming 2025 Future Homes Standard, making it a smart investment for long-term compliance.

Is vacuum glazing environmentally friendly?
Yes. Fineo vacuum glazing is made in Belgium using renewable energy, contains no harmful gases, and is 100% recyclable. Its long lifespan means fewer replacements, reducing overall environmental impact.

The Clear Choice

From single glazing to slimline, double, triple, and vacuum glazing, the options for energy efficient windows vary widely in performance, durability, and sustainability. While standard solutions have their place, the reality is clear: vacuum glazing offers the best balance of heritage compatibility, cutting-edge performance, and long-term value.

Whether you’re preserving a Georgian townhouse, upgrading a Victorian terrace, or building a modern eco-home, Fineo vacuum glazing represents the future of window technology — available today.

Contact Fineo Today

By Fineo VIG|2025-09-24T13:23:14+00:00September 24th, 2025|News|

FINEO Sets a New Standard: The First Vacuum Insulating Glass with a Third-Party Verified EPD

AGC Glass Europe has announced that FINEO has become the first and only Vacuum Insulating Glass (VIG) in the world to achieve a third-party verified Environmental Product Declaration (EPD). This independent certification covers both its standard and Low-Carbon configurations, giving architects, specifiers, and developers the assurance of transparent and reliable environmental data.

Why EPDs Matter

Environmental Product Declarations are independent, standardised documents (EN 15804 + A2 and ISO 14025 compliant) that measure the full environmental impact of a product across its life cycle. For construction professionals, EPDs provide objective data to compare products on factors such as Global Warming Potential (GWP) — making them a key decision-making tool for sustainable building projects.

Outstanding Low-Carbon Performance

Among the verified FINEO products, the 8 mm Low-Carbon variant stands out. Manufactured using AGC’s Low-Carbon PLANIBEL glass range, it is produced in high-efficiency furnaces with renewable electricity, a higher share of recycled glass (cullet), and low-carbon soda ash.

This results in an exceptionally low cradle-to-gate GWP of just 18.9 kg CO2 eq./m², outperforming many traditional double and triple-glazing units. It sets a new benchmark for insulating glass, offering both cutting-edge performance and one of the lowest EPD values available today.

A Sustainable Window Choice for Irish Residential Construction

With environmental performance now a decisive factor in building design, FINEO’s verified EPD enables professionals to make clear, evidence-based comparisons. By combining VIG technology with Low-Carbon PLANIBEL glass, FINEO leads the way in sustainable glazing solutions — without compromising on aesthetics or thermal efficiency.

Built to Last

Produced in Belgium for the European market, FINEO is 100% recyclable, designed for a service life of up to 60 years, and backed by a 20-year product guarantee. It is also the only vacuum insulating glass to carry the CE marking, giving further confidence to specifiers.

This milestone reinforces AGC’s wider commitment to sustainability and aligns with the EU’s objectives for energy performance in buildings. For projects prioritising both technical quality and measurable environmental benefits, FINEO is now the proven choice.

To read this article on AGC’s website click here.

For more information on Fineo products, you can contact us below.

Heritage Window Maintenance in Ireland
Heritage Window Maintenance in Ireland

Heritage Window Maintenance in Ireland

By Fineo VIG|2025-08-20T15:05:01+00:00August 20th, 2025|News|

Heritage Window Maintenance in Ireland

Preserving Character While Improving Comfort

Heritage and period homes are a vital part of Ireland’s built environment — from Georgian townhouses in Dublin and Limerick, to Victorian terraces in Cork, and traditional stone cottages across rural Ireland. These properties carry unique architectural charm. Their original single-glazed timber windows are often a weak point when it comes to energy efficiency, comfort, and ongoing maintenance.

Why Heritage Windows Matter

Windows form a key part of the historic character of Irish homes. The Department of Housing’s Architectural Heritage Protection Guidelines stress that original timber sash windows should be retained wherever possible, as they contribute to the authenticity and historic value of a property.

Unfortunately, Ireland’s damp climate, combined with coastal exposure and heavy rainfall, can accelerate the deterioration of timber frames, making regular inspection and maintenance essential.

The Cost of Neglect

Poorly maintained windows in heritage homes can lead to:

Draughts and significant heat loss, adding hundreds of euros to annual heating bills.
Condensation, leading to rot and long-term structural damage.
Reduced comfort and higher energy demand, undermining sustainability goals.

Upgrading Without Compromise

The challenge for Irish homeowners is balancing conservation with modern comfort. Traditional double glazing often requires replacing historic frames, which may not be permitted in protected structures.

This is where advanced solutions like vacuum glazing come in. Fineo glazing allows the original timber frames to be retained while upgrading the glass itself. It delivers thermal performance on par with triple glazing but at a fraction of the weight and thickness — a critical factor for delicate sash windows.

Up to 8x better insulation than single glazing.
Energy savings of 30–40% on heating bills.
Comfort improvements without altering the external appearance of the property.

Resources for Irish Homeowners

Heritage Council of Ireland – guidance on maintaining historic homes.
Department of Housing: Architectural Heritage Protection – planning rules for protected structures.
SEAI Grants – financial support for energy efficiency upgrades as part of retrofit projects.

FAQ: Heritage Window Maintenance in Ireland

1. Can I replace heritage windows in a protected structure?
Usually not. Planning guidelines encourage retaining and repairing original frames. However, upgrading the glass within those frames is often allowed.

2. Do SEAI grants cover window upgrades?
Yes, but only as part of a whole-house retrofit project through the One Stop Shop service — not as a standalone measure.

3. How often should I maintain timber sash windows in Ireland?
Every 3–5 years, depending on exposure. Coastal and damp environments may require more frequent attention.

4. What are the signs my windows need attention?
Peeling paint, draughts, rattling sashes, and condensation between panes are clear indicators.

5. Can vacuum glazing be fitted into my existing timber frames?
Yes. Fineo vacuum glazing is designed to fit directly into heritage frames without altering their appearance.

6. How much energy can I save by upgrading?
Up to 30–40% reduction in heating demand, depending on the size and type of property.

7. Is vacuum glazing suitable for listed buildings?
Yes — because it preserves the original joinery, it aligns with conservation requirements. Always confirm with your local planning office.

8. Will my windows still look the same?
Yes. From the outside, there is no visible difference, so the historic aesthetic is maintained.

9. Does vacuum glazing help with noise reduction?
Yes. It significantly reduces external noise, a benefit for urban areas such as Dublin, Cork, and Galway.

10. Where can I learn more about caring for heritage properties in Ireland?
The Heritage Council and Irish Georgian Society provide excellent resources on conservation and maintenance.

The 1 Mistake You’re Making with Your Sash Windows in a Heatwave – And It’s Sending Your Energy Bills Soaring
The 1 Mistake You’re Making with Your Sash Windows in a Heatwave – And It’s Sending Your Energy Bills Soaring

The 1 Mistake You’re Making with Your Sash Windows in a Heatwave – And It’s Sending Your Energy Bills Soaring

By Fineo VIG|2025-08-13T10:07:44+00:00August 13th, 2025|News|

The 1 Mistake You’re Making with Your Sash Windows in a Heatwave – And It’s Sending Your Energy Bills Soaring

When a heatwave hits, most of us instinctively fling open our windows and let the air in. It feels refreshing — at least for a while. But here’s the catch: if you leave your sash windows open all day during hot weather, you could be making your home harder to cool, forcing fans and air conditioning to work overtime, and sending your summer energy bills through the roof.

Why Open Windows Can Work Against You in a Heatwave

In hot, still conditions, open windows often do little more than let warm air seep in and cool air escape. By mid-afternoon, your home’s interior can actually be warmer than if the windows were closed, blinds drawn, and ventilation managed strategically.

Traditional double glazing in restored sash windows can help, but in extreme heat, it often struggles to keep internal temperatures stable. The sun’s radiant heat still penetrates through the panes, and older timber frames can leak cool air.

How Vacuum Glazing Keeps You Cool

Fineo vacuum glazing is a breakthrough for heritage windows. By replacing the air (or gas) gap in traditional double glazing with a near-vacuum, heat transfer is drastically reduced. This means:

Up to 8 times better thermal insulation than single glazing — without altering your original sash frames.
Better performance than standard double glazing, keeping your home cooler in summer and warmer in winter.
Minimal impact on the appearance of period windows, preserving their character while upgrading comfort.

In a heatwave, Fineo glazing slows down the rate at which external heat seeps indoors, meaning you’ll rely less on fans, portable coolers, or air conditioning — all of which can be costly to run.

Summer Sash Window Prep & Maintenance Tips

Even with high-performance glazing, a little seasonal care goes a long way. Before temperatures spike:

Check seals and draught-proofing – Any gaps in your sash frames will allow hot air in and cool air out.
Inspect cords and pulleys – Smooth operation means you can open and close windows strategically for night-time cooling.
Clean and maintain timber – Well-painted, healthy frames resist swelling or sticking in humid weather.
Use blinds or shutters – Closing them during peak sun hours can block up to 75% of solar heat gain.
Ventilate wisely – Open windows at night or early morning when the outside air is cooler, then close them as temperatures rise.

Why Traditional Double Glazing May Not Be Enough

While standard double glazing offers some protection, it doesn’t match vacuum glazing’s ability to regulate temperature during extreme weather. With rising global temperatures and more frequent heatwaves in the UK and Ireland, investing in a glazing solution that works year-round is becoming essential — not just for comfort, but for controlling household energy costs.

Bottom line: In summer, it’s not about keeping your windows open all day — it’s about keeping the right heat out and the right cool in. Fineo vacuum glazing lets you enjoy your period sash windows without compromising on comfort, efficiency, or heritage charm.

Case Study: Upgrading Period Sash Windows with Fineo Vacuum Glazing in Wexford
Case Study: Upgrading Period Sash Windows with Fineo Vacuum Glazing in Wexford

Case Study: Upgrading Period Sash Windows with Fineo Vacuum Glazing in Wexford

By Fineo VIG|2025-08-06T08:27:29+00:00July 31st, 2025|News|

Case Study: Upgrading Period Sash Windows with Fineo Vacuum Glazing in Wexford

In the scenic countryside of Wexford, Marie owns a beautiful period home filled with character, charm, and—draughty, single pane, sash windows.

Like many older homes across Ireland, her beautiful property features original timber sash windows that, while aesthetically striking, offered poor insulation and contributed to mounting energy bills.

Keen to preserve the look of her home without compromising on comfort or performance, Marie turned to Energlaze for a solution. Her goal was to retain her traditional sash frames while significantly improving energy efficiency, acoustic insulation, and indoor comfort.

The Challenge: Traditional Frames vs. Modern Performance

Marie’s primary concern was heat loss through her windows.

With only single glazing in place, her sitting room quickly lost warmth, particularly during the colder months. She often found herself avoiding sitting near the windows due to the noticeable chill and draughts.

She was clear on one thing: replacing the sash frames outright wasn’t an option. “I love the look of the windows—they’re part of the house’s story,” she said. But she knew something had to change.

The Solution: Fineo Vacuum Glazing Retrofit

Energlaze recommended Fineo, a next-generation vacuum-insulated glazing (VIG) solution that fits seamlessly into existing timber frames. At just 6.7mm thick, Fineo is four times thinner than traditional triple glazing, yet it achieves U-values as low as 0.7 W/(m²·K)—matching or outperforming triple-glazed alternatives.

This ultra-slim profile made it the perfect choice for retrofitting into Marie’s sash frames without altering their appearance. The Fineo units also contain no inert gases like argon or krypton, meaning their thermal performance does not degrade over time. That’s a major advantage over double glazing, which can deteriorate after 10–15 years.

The Installation Experience

Energlaze’s experienced team carried out the work with minimal disruption. “Darren at Energlaze managed the install and was fantastic to work with. They were tidy, efficient, and really respectful of the house,” Marie recalled. The entire process was completed in a few days, with no need to rip out existing joinery or repaint interiors.

The Results: Silent, Warm, and Beautiful

After installation, the change was immediate. Marie described a noticeable increase in warmth and dramatic reduction in draughts. “You can feel the difference just walking into the room,” she said. Fineo’s advanced thermal performance means up to 34% less heat loss compared to standard double glazing, and as much as 8 times better insulation than single glazing.

With Fineo Vaccum Glazing noise is also reduced. Fineo achieves up to 35 dB sound insulation, helping block out noises such as passing traffic.

Aesthetically, the slim profile meant that nothing had changed visually from the outside or inside. Marie’s windows still looked original, but now offered the performance of a modern energy-efficient home.

Why Fineo is Ideal for Heritage Homes

Marie’s case highlights the ideal balance Fineo offers for owners of listed buildings, conservation properties, or any home where window preservation is essential. It delivers all the benefits of modern glazing—thermal comfort, sound insulation, condensation reduction, and longevity—without impacting the building’s architectural integrity.

Fineo Glazing: Key Benefits

Thermal Insulation: U-value as low as 0.7 W/(m²·K)
Ultra-Slim Design: Just 6.7mm thick, fits seamlessly into heritage window frames
Long-Term Performance: No gas-fill = no degradation over time
Acoustic Insulation: Up to 35 dB sound reduction
Sustainable: Fully recyclable glass and lead-free spacer
Condensation Resistant: Up to 12x better resistance compared to single glazing
Light Transmission: Maintains 80-85% light transmission, similar to single glazing
Vacuum Seal: Micro-edge seal with no evacuation port ensures a clean, uninterrupted view

Fineo Vacuum Glazing – FAQs

Q: What makes Fineo different from double or triple glazing?
Fineo uses vacuum-insulated glazing (VIG) technology, eliminating the need for gas-filled cavities. It offers the thermal performance of triple glazing in a unit just 6.7mm thick—ideal for retrofit into existing frames.

Q: Can Fineo be installed in heritage or listed buildings?
Yes. Fineo is specifically suited for properties with conservation requirements, as it allows the original window frames to remain in place, preserving the visual character of the home.

Q: How does Fineo perform over time?
Unlike argon-filled double glazing, which can lose efficiency over time due to gas leakage, Fineo’s vacuum-sealed design ensures long-term performance with no thermal degradation.

Q: Will Fineo reduce condensation?
Yes. Fineo significantly reduces condensation build-up thanks to its high thermal resistance, making it an excellent choice for colder climates and bathrooms.

Q: Is Fineo environmentally friendly?
Fineo glazing is lead-free and fully recyclable. It also helps reduce energy consumption, contributing to lower carbon emissions in homes.

Q: What is the warranty on Fineo glazing?

Fineo offers a 20-year warranty, but its performance is expected to last far beyond that due to its stable vacuum-sealed structure.

Q: How quickly can it be installed? Installation is typically fast and minimally disruptive, particularly when retrofitting into existing sash or timber window frames.

Ready to Upgrade Your Windows Without Replacing the Frames?

If you’re looking to improve comfort, reduce bills, and protect the value of your period home, Fineo vacuum glazing installed by Energlaze is a future-proof investment. Contact our team today to schedule your no-obligation consultation and experience the Fineo difference.