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Improve the efficiency of your radiators by making a DIY heat reflector out of foil. Tape a sheet of heavy-duty aluminum foil to a large piece of cardboard with the shiny side facing out and place it behind the radiator. The heat will bounce off the foil and into the room instead of being absorbed by the wall. If your radiators have covers on them, tape a piece of aluminum foil under the lid, shiny side down, to direct heat down and into the room.
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