Young worker installing window in flat

Weatherization comes in many forms, but the easiest is closing up the cracks around windows and doors. According to the Energy Department, 25 to 30 percent of household heating and cooling is lost through windows.

You can first identify leakage points by turning on your kitchen and bathroom exhaust fans, creating a slight pressure differential between indoors and outdoors, then holding up a lit incense stick to potential problem areas. If the smoke wavers or blows in one direction, there’s a draft that needs fixing.