How much can energy efficient windows save?
Replacing old single glazing or outdated double glazing with modern A-rated windows can reduce heat loss by up to 70%.
For a standard semi-detached UK home, this can mean annual heating savings of £100–£300. Detached or larger homes may save even more because of increased window area and higher energy requirements.
Key factors that influence savings include U-values, airtightness, window size, property type, and existing insulation.
Which window styles offer the best efficiency?
Window style affects how well a property retains heat. Casement and tilt & turn windows seal tightly, helping to reduce draughts and heat loss, while traditional sash windows may leak more air.
Choosing well-sealed, high-performance designs ensures lower bills and more comfortable living spaces. The County team can advise on the best options for your home.
A, B, and C-rated windows – what’s the difference?
The WER system grades windows from A to C. A-rated windows hold in the most warmth and reduce energy consumption, while C-rated windows meet minimum standards but offer less comfort and savings.
Upgrading from C to A-rated windows can improve warmth, cut draughts, and lower energy bills.
Why U-values are key
U-values measure heat escape through windows. Lower numbers mean better insulation. Typical ranges:
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 checking both WER and U-values, you can select windows that save energy, lower bills, and keep your home comfortable. County’s team can guide you through the energy efficient windows options to make the choice simple.
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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