‘A’ Rated Windows - Energy Rating Information

The energy saving trust states that around 20% of heat lost from an average home occurs through the windows. This heat loss accounts for an annual half tonne of CO2 per home added to the atmosphere, and results in in significantly increased fuel bills. To maximise the benefits achieved when replacing windows the government have adopted an energy rating system similar to that used on white goods.


The Harveys windows specification already complied with the requirements by using a low “e” (emissivity) glass, together with argon filled units manufactured with a “warm edge” spacer.


The thermal images are pictures of the infrared radiated heat, lost through the windows, doors and fabric of a building. The example here is of a house where the existing uPVC double glazed windows on the first floor have ben replaced with our Veka uPVC frames glazed with Planitherm Total Glass and Argon filled. As shown in the picture the heat lost through the new windows is virtually nil, whilst the old windows show a considerable heat loss. The windows on the ground floor are the original uPVC double glazed installed some years ago. This proves how all double glazing is not the same and our latest windows will definitely make a marked difference to the comfort of your home as well as reducing heating costs considerably.


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Triple Glazing

We are now in a position to offer a triple glazed option on our windows and our sales team will be happy to discuss the pros and cons of this product with you if you are interested.

British Fenestration rating council

Planitherm logo

Edge tech logo

energy window index

Energy Window heat map living area


Harvey's Designer