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U value real world difference. .18 vs .2


Oz07

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Could someone please quantify in laymans terms the real world difference of a wall u value between .18 and .2 for me? Single storey dwelling with around 90m2 of walls exc apertures. It's the difference of 25mm on chosen wall make up and I think the gain of 25mm would be better.

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It works out as 1.8 watts for each degree of temperature difference, so assume the average difference is 10 degrees, your poorer U value would lose 18 watts. Over a year that would be 158kWh, which will probably cost between £8 and £20 depending on fuel type.

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