As you survey your home for air leaks, carry along a tape measure and write down the dimensions of each door or window that needs weather stripping. If you feel a leak along just one jamb, you might be able to get by with adding or replacing material only at that edge -- but take a close look at the others just to be sure. Total up your measurements and add about 10 percent for waste.

Make mental notes about how each window and door fits into its frame. You need to pay attention to this because weather stripping -- whether it is made of metal, vinyl, felt, rubber, or a combination of these -- depends on a tight fit to seal out drafts. Some materials work only with swinging doors or sashes; others fit sliding units, as well. The chart on the next page briefs you on the products you're likely to encounter.

Spring Metal The Scoop: Spring metal weatherstripping is fairly easy to install; cut it with snips, then tack in place to make an invisible installation. The cost is moderate and it has excellent durability.

Rolled Vinyl and Felt The Scoop: Easy installation; cut with scissors or snips, then tack in place. These are visible when installed. The cost is moderate and durability good.

Self-Adhesive Foam The Scoop: Very easy installation; snip it with scissors, peel off the backing, and press it in place. Cost is low, but durability is only fair

Interlocking Metal Strips The Scoop: Comes in several different configurations, all fairly difficult to install because you must align them exactly; work only on doors and casement windows. The cost is high and the durability is excellent.

Door Shoes, Sweeps, and Thresholds The Scoop: Some mount on the bottom of the door; others replace an existing threshold. Installation can be tricky for some types, but relatively easy for others. The cost ranges from moderate to high, the durability from fair to excellent.