Energy Efficiency

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Just a Quote: Expert advice without the hard sell

How is the energy efficiency of windows and doors determined?

The energy efficiency of a window is determined by the particular features of the window frame, the insulating glass sealed units and the seals between the two. We will cover each element of a PVCu double glazed window to assess what makes windows and doors energy efficient and we can cover this by asking a series of questions: –

What Is A Sealed Unit? Click Here...

What Is Low e glass and How Does It Work? Click Here...

What’s in the gap between the two sheets of glass? Click here...

Do other types of glass help improve energy efficiency? Click here...

Can any other parts of an insulating glass sealed unit be improved? Click here...

Can PVCu window frames be made more energy efficient? Click here...

What about the window seals? Click here...

What about triple glazing? Click here...

The ‘A’ rating of a window refers only to energy efficiency

Consumers ought to be aware that the ‘A’ rating of a window or door refers only to energy efficiency and there are many other factors which should be taken into account to determine the overall quality and suitability to individual situations.

Some companies advertising ‘A’ rated windows are playing on the fact that if a window is ‘A’ rated for energy efficiency, it must be better, in every respect, than other windows that are not.  An ‘A’ rated window is certainly better than a ‘B’ or ‘C’ rated window in terms of energy efficiency, but just being ‘A’ rated doesn’t mean it’s the best type of window available. There are many other factors to take into account than energy efficiency when deciding which type of window to install.

Sculptured profiles generally look better than plain or chamfered ones, the quality and performance of locking systems differs enormously and the quality of the installation and customer service are also important. All of these factors will affect the cost of replacement windows, as will the installation company’s marketing and selling costs, other overheads and built-in profit margin.

Energy efficiency of windows - Window energy rating certificate

Typical Window Energy Rating (WER) certificate for a PVCu casement window. This shows an ‘A’ rated window certificate with an Energy Index of zero, courtesy of Dempsey Dyer