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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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