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New Exterior Walls
Existing exterior walls should already be insulated thanks to building codes and best practices. However, new walls from recent renovations should also be insulated: Basically, any wall that faces the outside requires adequate insulation.
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With proper floor insulation, you may not need to worry about insulating a rarely used basement area. But if you plan on controlling the temperature in your basement, you’re going to need the proper insulation for your foundation walls. Keep in mind that this should also include the proper moisture barriers so you don’t run into trouble later on.
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Doors and Windows
Weatherstripping around doors and windows keeps cold air out and warm air in. Without weatherstripping, small spaces will leak air and cost you on monthly heating bills. Check the weatherstripping around your house: If it’s worn or missing, then it’s time for a replacement.