How much can energy efficient windows save on heating bills?
Replacing old single glazing or outdated double glazing with modern A-rated windows can reduce heat loss by up to 70%.
For a typical semi-detached home in the UK, this can translate to savings of around £100–£300 per year on heating. Detached or larger homes usually see even higher reductions, due to increased window area and energy requirements.
Factors affecting your savings include U-values, airtightness, the size and number of windows, property type, and existing insulation.
Which window styles keep homes warmest?
Window design impacts efficiency, particularly through sealing. Casement and tilt & turn windows seal tightly, reducing draughts and heat loss, while traditional sash windows may allow more air to escape.
Opting for high-performance, well-sealed styles ensures lower bills and a cozier home. Our team at Mitchell can advise on the best options for your property.
A, B, or C-rated windows – what’s the difference?
The Window Energy Rating (WER) system grades windows from A to C. A-rated windows retain more heat and cut energy use, while C-rated options meet minimum building standards but offer less comfort and smaller savings.
Upgrading from C-rated to A-rated windows can noticeably improve comfort, reduce draughts, and lower heating bills.
Why U-values matter
U-values show how much heat a window allows to escape – the lower the figure, the better the insulation. Typical ranges you may come across include:
Single glazing: 5.0–6.0 W/m²K
Old double glazing: 2.8–3.0 W/m²K
Modern A-rated windows: 1.2–1.6 W/m²K
By considering both WER and U-values, you can identify windows that improve warmth and efficiency. Mitchell’s friendly team can help simplify the details, making it easier to choose high-performance windows that enhance your home.
LOOKING TO REPLACE YOUR WINDOWS?
We have a fantastic range to choose from so whether it’s a modern style or traditional timber effect windows – we are confident that we will have windows to improve any home to give it the finished look with elegance.
LOOKING TO REPLACE YOUR WINDOWS?
We have a fantastic range to choose from so whether it’s a modern style or traditional timber effect windows – we are confident that we will have windows to improve any home to give it the finished look with elegance.
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