How much can energy efficient windows save on heating?
Switching old single or poorly performing double glazing to A-rated energy efficient windows can reduce heat loss by up to 70%.
For a typical UK semi-detached home, this usually equates to savings of £100–£300 per year on heating bills. Larger or detached properties can achieve even greater savings because they have more windows and higher energy needs.
Key factors influencing your results include U-values, airtightness, window area, property type, and existing insulation.
Which window styles are most effective?
Seals matter when it comes to efficiency. Casement and tilt & turn windows close tightly, helping to cut draughts and retain heat, whereas sash windows can allow more air to escape.
Choosing well-sealed, high-performance designs ensures lower energy bills and more comfortable rooms. Our Mid Wales team can guide you toward the best options for your home.
Understanding A, B, and C-rated windows
The Window Energy Rating (WER) system classifies windows from A to C. A-rated units are the most efficient, keeping more warmth inside and reducing energy costs. C-rated windows are cheaper and meet minimum regulations but don’t offer the same comfort or savings.
Moving from C to A-rated windows can make a real difference, reducing draughts, warming rooms, and cutting bills.
Why U-values are important for energy efficiency
U-values measure heat loss through windows. The lower the number is, the better the insulation. Typical figures include:
Single glazing: 5.0–6.0 W/m²K
Older double glazing: 2.8–3.0 W/m²K
Modern A-rated windows: 1.2–1.6 W/m²K
By checking both WER ratings and U-values, you’ll find energy saving windows that enhance comfort and reduce heating costs. The Mid Wales team can make the process simple, helping you select the right windows for 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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