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A homeowner has part of the outside brick wall of her house demolished and fits double-glazed glass doors in the gap. The U-value of the wall was 0.4 and the U-value of glass doors is 1.8. What does this mean?

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A homeowner has part of the outside brick wall of her house demolished and fits double-glazed glass doors in the gap. The U-value of the wall was 0.4 and the U-value of glass doors is 1.8. What does this mean?





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