What’s the Difference Between A, A+ and A++ uPVC Windows?

When choosing uPVC windows, energy efficiency is often an important factor. However, many of us are unsure what the ratings we see on our windows mean. In this article, we’ll delve into the Window Energy Rating (WER) and answer what the difference is between A, A+ and A++ windows.

The Window Energy Rating (WER) 

Introduced in 2004, the Window Energy Rating (WER) is a way to independently verify a window’s energy performance. Ratings range from E to A++, however, since 2010, legislation has been passed stating all new uPVC windows must have a minimum rating of C or above. 

So, what factors determine the energy rating of a uPVC window? When assessing a window’s energy performance, experts look at the following:

• U – Values. To measure how much heat is lost through thermal transference. 
• L – Values. To measure how much air escapes from the window frame. 
• G- Values. To measure how much heat is lost through the glass.

The higher the rating, the better the window’s performance, and it’s generally agreed that a rating of A and above offer the best performance.   

The Difference Between A, A+ and A++

Whilst WER helps determine how well windows perform from an energy perspective, it’s important to note a window’s WER does not determine its security or weather-proofing performance.

When ranking A vs A+ vs A++ uPVC windows, not all models are made equal. Below is some guidance on what to expect from different A-rated uPVC windows.  

A

An A-rated uPVC window offers excellent thermal performance, helping to retain heat indoors when it’s cold and prevent excess heat transfer through the glass and frames during the warmer months. 

A+

An A+ rated uPVC window provides enhanced performance across the board, ideal for environments with extreme changes in temperature throughout the year.

A++

The top-rated A++ uPVC offers unparalleled energy-efficiency and advanced glazing. Whilst a bigger investment, you could potentially save much more money on your heating bills over time. 

A vs A+ vs A++ rated uPVC Windows

Ultimately, the uPVC you choose is dependent on factors such as your budget, the installation costs, where you live, the type of property you have and your long-term energy bills. Remember, the team here at Oakstone Windows & Fascias specialise in the installation of A++ WER uPVC windows. Why not give us a call today to find out more?