When it's cold outside, the draughts and air leakage under doors and through windows can increase heating costs by 25 per cent. A 2cm gap under a single external door will remove all the heat produced by a single bar electric radiator, which costs 10 – 15 cents an hour to run). But draughtproofing is one of the easiest and cheapest home improvements, with plenty of adhesive products available at the hardware store for less than $10.
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