The average house leaks enough air to feel like an open window all winter — and almost every leak is cheap to seal. Here’s the weekend checklist: find the drafts, weatherstrip, film the windows, and caulk the rest.
Find the drafts first
Before you buy anything, hunt down where the cold actually gets in. On a windy day, move a lit incense stick or a candle flame slowly around window and door edges, electrical outlets on exterior walls, attic hatches, and where pipes or cables enter — wherever the smoke dances, you’ve found a leak. Those small gaps add up to the equivalent of leaving a window open all winter, and each one is cheap to seal.
Weatherstrip doors and windows
Exterior doors are the biggest single offender. Add a door sweep along the bottom (you should not see daylight under a closed door) and fresh weatherstripping around the frame where the old foam has crushed flat. For windows, V-seal or foam tape in the sash tracks stops the whistling. It’s a screwdriver-and-scissors job — no contractor needed.
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Insulate the windows
If you’ve got older single-pane or leaky windows, a window insulation film kit is the highest-return dollar in this whole list: tape the clear shrink film to the frame, warm it with a hair dryer, and it forms a nearly invisible second pane that kills the draft and cuts heat loss. For a cozier fix, thermal/insulated curtains add a real layer at night. Neither is permanent, so renters can use them too.
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Caulk the gaps and seal the outlets
For fixed gaps that don’t open — around window trim, where siding meets the frame, gaps at baseboards — a bead of exterior or paintable caulk seals them for years. Don’t overlook exterior-wall electrical outlets and switches: pop off the cover and add a cheap foam gasket behind it. Individually tiny, collectively a real draft. A can of spray foam handles bigger gaps around pipes and cable entries.
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The finishing touches (and the payoff)
Close out the odd leaks: insulate and weatherstrip the attic hatch (huge, since heat rises straight to it), slide a draft stopper under stubborn doors, and close the fireplace damper when there’s no fire — or add a chimney balloon. Done together, sealing and weatherstripping can trim a noticeable chunk off a winter heating bill, and the whole list is a weekend and a modest trip to the hardware store.
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