Energy Efficiency and U-value
What is U-value?
U-value is also often referred to as «thermal transmittance», which refers to the rate at which a structure allows the transfer of heat energy, divided by the temperature difference on either side of the structure.
Therefore, U-values are essentially a measure of the effectiveness of a material’s insulation. When this value is lower, it means that the material is considered as performing more efficiently as an insulator against heat loss from an internal space, than when it is a higher value.
U-value is measured in W/m²K. The average cavity wall will have a U-value of around 1.6 W/m²K, whereas a wall built of solid brick will be lower at around 2.0 W/m²K. For a window, this can rise to around 2.8 W/m²K. This is typical for existing dwellings, but many countries now have guidelines regarding the maximum allowed U-value that a new build window may have.
What’s the difference between U-value and R-value?
These two things are essentially the same, but with different applications. When talking about insulation within walls or ceilings, the industry favours R-value. When we talk about windows, we talk about U-value. R-values that are high are considered better insulators, whereas for U-values, the insulation is better the close the number is to zero.
How does U-value rating affect your home?
As U-value refers to the rate at which heat is lost through your windows, it is essentially a measure of your home’s energy efficiency. If your windows have a poor (high) U-value, then you are wasting energy that could be saved through the installation of better quality windows.
By installing new-build windows such as those manufactured by Blue Sky Windows, you can improve your U-value and as a direct result, your home’s ability to retain heat, which means that it will cost you less to heat your home. This will in turn lead to a reduction in energy bills for heating.
How Can I Improve my U-Value?
Blue Sky Windows only use the highest quality components from German manufacturers in producing doors and windows to your specification. Windows in old-builds often have an average of 8 to 10 W/m²K, which means that you’ll be losing a great deal of heat through your windows. Due to industry requirements, it is not typical to have a U-value any higher than 1.6 W/m²K in newly-installed windows.
All windows built by Blue Sky Windows are optimised to have as low a U-value as possible, which means you’ll immediately be improving the energy efficiency within your home. As a bonus, you’ll also be better insulting yourself against disruption from noise outside the home, for example traffic, railways or noisy neighbours, and protection against extreme weather.
What customers love about us
«Dear Vicky, I am sorry it has taken me so long to write and tell you how much we have enjoyed your friendly service and how much we love the stunning windows and doors in our new home- they make it just that little more special. Paul and I simply love their look and their functionality. We also sincerely appreciate your responsiveness and the way you conduct business. We have recommended your company to others because of our satisfaction with your service and your product. If ever we need to purchase or replace windows we will certainly go straight back to you!»
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