You could save around 10% off your energy bill from draught-proofing your windows and doors. Additionally, air leaks can cost you up to 20% of valuable heating in your home; draught-proofing can prevent this loss. A draught-proof home is more comfortable at lower temperatures. As a result, you can turn down the thermostat and conserve energy. Draught proofing often pays for itself within a year and will reduce your energy costs for the years to come.