39. Seal doors and windows with caulk, weatherstripping and plastic film. Your time and money of $50 in weatherizing supplies can help heating costs by 2 to 3 times a lot. Don't your investment basement home! Blower belt tension - At times, a furnace is part of a forced air community. In such cases, they stand with just one risk to getting adversely encountering an out-of-tension blower belt buckle. Make sure the blower belt is neither too tight nor too reduce. ...