How to Combat Heat Loss Through Windows
Posted on 30th April 2025 at 14:42
With energy costs continuing to rise, homeowners are looking for ways to cut their bills wherever they can. From layering up and turning off radiators to taking cold showers, many are trying extreme measures. However, one major issue often goes unnoticed: heat loss through windows.
At NRG Glass, we understand how much heat can escape through inefficient glazing. In this article, we’ll explore how to reduce heat loss through windows. Modern day solutions such as secondary glazing can make a big difference to your home’s warmth and your energy bills.
How Much Heat is Lost Through Windows?
Many homeowners are surprised to learn just how much heat is lost through windows. According to GOV.UK, around 18% of household heat loss occurs through windows.
Single-glazed windows lose heat nearly twice as fast as double glazing, which is why secondary glazing has become an increasingly popular solution.
Common Causes of Window Heat Loss
Window heat loss can occur for several reasons, from single glazing to moisture build-up. Below, we break down the most common causes of heat escaping through your windows.
1. Single Glazing
Single glazing is one of the biggest contributors to window heat loss, if not the biggest. With only one pane of glass separating you and the outside, they offer minimal insulation and let warm air escape easily. In winter, this can lead to high energy builds and freezing rooms, especially in listed buildings.
2. Poor Sealing and Draughts
Poor sealing can cause significant heat loss, even with double glazed windows. Gaps around the window or old silicone seal can let cold air in and warm air out. This can lead to draughts, making it harder to heat your home in winter.
3. Condensation or Moisture Build Up
Moisture trapped between panes (in failed double glazing) or condensation on single glazing can cause great window heat loss. Due to water being a better conductor of heat than air, excess moisture makes it easier for warmth to escape, particularly during colder months.
How to Reduce Heat Loss Through Windows
If you're wondering how to reduce heat loss through windows, the good news is that there are cost-effective solutions available. Whether you’re in an older property with single glazing or just looking to improve energy efficiency, these options will bring down your energy costs.
Secondary Glazing
Secondary glazing is the process in which a second pane of glass or acrylic is fitted inside your existing window frame. This creates an air gap that acts as an insulating barrier, helping to reduce heat loss and minimise draughts.
New Sealing
Resealing around your window frames is a quick DIY fix to help prevent draughts and heat loss. Installing weatherstripping, window seals or even self-adhesive foam strips can block cold air from entering and stop warm air escaping. This solution is affordable and offers an immediate improvement in comfort
Curtains or Blinds
While installing curtains or blinds won’t completely prevent window heat loss, they can help reduce it by acting as an additional insulating barrier. When used alongside secondary glazing, this combination becomes a highly effective way to retain warmth and lower your energy bills.
Why Secondary Glazing is the Smart Solution to Window Heat Loss
Secondary glazing from NRG Glass provides an extra insulated barrier that dramatically reduces heat loss through windows. With years of experience serving homes in Essex and the surrounding areas, our expert manufacturing and installation services ensure a perfect fit.
Our bespoke secondary glazing preserves original frames while boosting thermal efficiency and reducing energy bills. Enjoy quieter, more comfortable living spaces and significant long-term savings when you choose NRG Glass.
Ready to upgrade your windows and save on energy costs? Contact NRG Glass today for a free consultation and secondary glazing quote.
If you have any questions about us or secondary glazing, feel free to get in touch or visit our frequently asked questions.
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