Seal doors and windows. Drafts are the enemy of a cozy home, as nothing quite so quickly steals comfort as a jolt of cold air. Most of the time, dodging drafts means plugging up any cracks and crevices around openings to the outdoors. Caulk and weatherstripping commonly remedy such issues, but direct measures like door sweeps and so-called "draft snakes" also do the trick. To cut down further on heat loss from windows, you may even decide to put up plastic insulation film or, for that matter, curtains. First, determine where exactly drafts are entering your house; the locations of the problem areas may suggest their own solutions.