Window Weatherproofing: 4 Cheap Fixes for Drafty Windows

TL;DR: Drafty windows quietly drain your heating bill all winter. Four fixes take under an hour combined — and cost very little.

_Last reviewed: July 2026 · 2 min read_

Drafty windows can quietly inflate your heating bill all winter. The good news: four fixes take under an hour combined and cost very little — check the weatherstripping, add a draft snake, apply shrink film, and caulk the frame gaps. Together they make a cold room noticeably warmer.

How do I check window weatherstripping?

Inspect it every fall. The weatherstripping around a window's moving parts gets brittle, flattened, or torn over time, leaving gaps. Run your hand around the sash on a windy day — if you feel a draft, peel out the old strip and replace it with fresh adhesive foam or V-seal. Cheap and quick.

Do draft snakes actually work?

Yes, instantly. A draft snake (or draft stopper) is a simple fabric tube that blocks the gap along a window sill or door bottom where cold air pours in. It works in minutes, costs almost nothing, and you can even make one. Great for an old window you're not ready to replace.

What is window shrink film?

Shrink film is a clear plastic kit you tape over the inside of a window and shrink tight with a hair dryer, creating an insulating air gap — like a cheap, temporary storm window. It's barely visible, seals an old leaky window for the season, and pays for itself in saved heat.

Where should I caulk around windows?

Caulk the fixed gaps where the window frame meets the wall, inside and out. A thin, smooth bead seals cracks that weatherstripping can't (those handle the moving parts). See our caulking and weatherstripping guide for the full technique. Do it before the cold sets in.

Find the leaky rooms

Tracking which rooms run cold helps you target the fixes and watch the savings. Okoniq Property Hub keeps your weatherproofing notes with your utility bills and home maintenance records in one private place.

Frequently asked questions

Is it cheaper to weatherproof or replace windows?

Weatherproofing costs a fraction of replacement and recovers most of the lost heat — do it first. Replace windows when they're failing structurally, not just drafty.

When should I weatherproof windows?

In fall, before heating season, while temperatures are mild enough for caulk and film to apply well.

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FAQ

How much does it cost to weatherproof a drafty window?

Materials for all four fixes — weatherstripping, a draft snake, shrink film, and caulk — typically run $15 to $30 per window, making it far cheaper than replacement.

Can I weatherproof windows in winter if I didn't do it in fall?

Yes, but avoid days below 40°F for caulking and shrink film application, since adhesives bond poorly in cold temperatures and caulk won't cure properly.

How long does window weatherstripping last before I need to replace it again?

Adhesive foam weatherstripping usually lasts one to three years, while V-seal can last five years or more, so plan to inspect and replace it every fall.

Will shrink film damage my window trim when I remove it in spring?

No — the double-sided tape peels off cleanly if you pull slowly at a low angle, though you may need a little rubbing alcohol to remove any residue.