How does a window minimise air leakage?
Heat loss is quantified as a u-value and is measured in kW loss per m2 of window area per year, the lower the u-value the more efficient your windows will be. Here is a brief history of u-values over the decades an how u-values have improved:
The maximum and minimum sizes for uPVC sash windows are as follows:

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3) Solar gain is the measure of how much of the sun’s natural heat energy is allowed to enter your home, therefore allowing your home to gain free heat energy, thus reducing the need for additional heat sources during daytime hours.
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These factors are tested by the BFRC (British Fenestration Ratings Council) and a window is allocated a window energy rating which is an indication of how efficient the window’s performance is when used with a particular glazing specification. uPVC windows are rated from G up to A+ rating; A+ being the highest performing windows and G being the least energy efficient.

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The energy efficiency of conservatories is massively influenced by the conservatory roof glass specification. At AWM we recommend installing a self-cleaning glass with a u-value of no more than 1.2. This enables the conservatory to be used in all seasons by minimising the solar gain in Summer and minimising heat loss in the Winter.
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Self-cleaning glass also improves the aesthetics of conservatories as well as allowing more light to pass through the roof and into the conservatory. To arrange to view one of our recently completed conservatories in Doncaster please call us or visit our website.
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Conservatory roof glass comes in many different specifications. At AWM we recommend both Pilkington Activ’ self-cleaning glass and Saint-Gobain Bio-Clean glass. Self-cleaning glass has an active layer that is able to break down the organic dirt such as tree sap. When the conservatory experiences rainfall the rain is then able to wash away the inorganic dirt that is left as the roof glass has a non-stick layer.