U-value

American  

[yoo-val-yoo] / ˈyuˌvæl yu /

noun

1. a measure of the flow of heat through an insulating or building material: the lower the U-value, the better the insulating ability.

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Etymology

Origin of U-value

1945–50; U, symbol for internal energy

Example Sentences

The latest Crittall windows can achieve a U-value - a measure of their insulating performance - as low as 0.8, which is better than standard double-glazed windows.

From BBC

Any building material you can think of will have a U-value, a measure of how easily heat passes through the material - the lower the number, the better.

From BBC

Though still to be decided, incoming regulations in England could demand windows have a U-value of 0.8 or below.

From BBC

Pilkington has a glass product called energiKare that can achieve a U-value of 0.9 in a double glazed centre pane, for example.

From BBC

"It's thin and at the same time it has a very good, low U-value," she explains.

From BBC