A guide to window energy ratings

New windows can make everything better, from warmer room temperatures to less condensation and a more attractive appearance; however, the biggest selling point when it comes to new windows is that they are more energy efficient. This means that you need less energy in the form of heating, as the windows help to keep the warm air inside; however, new windows are not all made the same. A windows rating system has been developed in the UK to help you choose the right windows, and this quick guide to window ratings should help you to understand it in no time at all.

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A++ to E ratings
In the UK, all new windows are rated with an energy efficiency of A++ to E. If you have not already worked it out, A++ is the best and E is the worst. What is important to understand is that this rating refers to the energy efficiency of the entire window and not just the glass. This means you know you are getting a window that will really help with the energy efficiency in your home, from the edges of the frame to the centre of the glass. This A++ to E rating is used across appliances in the UK, including fridges and freezers.

U value
In addition to the A++ to E rating, a window will boast a U value. The U value represents how easily heat is passed through a material such as a wall, door or window. The less heat that can pass through, the better, as this means warm air will remain indoors during winter and heat will stay outdoors during hot summers. Unlike the letter rating of the window, the lower the U value, the better.

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The best window you can get is an A++ energy efficiency rating with a U value of 0.5 – 1.5. Established window suppliers such as Keane Windows that supply and fit windows Dublin offer a range of highly-rated A++ windows with excellent U values. It is also worth remembering that the more energy efficient your windows, the better your next EPC will be.

If you are considering new windows, it is really important that you look for the best rating possible, as this will affect the energy efficiency of your entire home.


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