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Once you've identified where unwanted air is sneaking through, tackle it with weatherstripping. Have ready a hammer, screwdriver(s), fasteners, measuring tape, and utility knife. Wipe clean, then dry the area requiring weatherstripping and estimate about ten percent more length to adjust for scrap.
Rubber or plastic self-adhesive foam strip and V-channel foam (between the jambs, sash, etc.) are simple to apply, inexpensive, and perfect for casement windows. Slightly more expensive magnetic gaskets, and self-adhesive, or hardware-applied spring metal strips are better suited for double hung and sliding windows. Rubber or vinyl tubular and foam filled gaskets, as well as felt, are of varying costs and effective, yet more practical for little seen areas.
When weatherstripping doors, use foam or metal strips on the top and sides, and aluminum or vinyl for the threshold. Should space still exist between the threshold and floor, a sweep can be installed, which would drop down when the door is closed. Always make sure that windows and doors can easily open and shut once weatherstripping is in place. A little weather proofing will go a long way!