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Why is cavity wall insulation better than air in the cavity.
Why is aluminium foil behind the radiator is good for stopping heat transfer?
Why are plastic frames of windows better than metal ones?
Cavity wall insulation reduces the energy transfer rate. It a is a better insulator than air it traps small air pockets.
Heat is reflected of shiny and light surfaces so it reflects the heat away from the wall and into the house reding heat transfer.
Metal is a conductor the heat would escape through the frame whereas plastic is not so it won't let the heat escape.
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