The U-Value measures how well a building component, e.g. a window, a wall, or roof, keeps heat inside a building.
What Is The U-Value
The U-Value is a measure of the heat flow through a building element. The higher the U-Value the more heat flows through so a good U-Value is a low U-Value, as you want to keep heat inside the building or outside depending on the climate you live in.
Comfortable indoor climate with good U-Values
In both cold and warm climates good U-Values are important measures for understanding the amount of energy that is needed to keep a comfortable inside temperature.
The technical explanation of the U-Value
Getting a little technical the U-Value physically describes how much thermal energy in Watts [W] is transported through a building component with the size of 1 square meter [m2] at a temperature difference of 1 Kelvin [K] (=1°C). Thus the unit for U-values is W/(m2K).
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