How to Stop Drafts from Doors and Windows

Drafts are the quietest way your home loses money. You don't hear them, you don't feel them most of the time, but they cost you $80–$250 every year in heating and cooling that escapes through gaps you've stopped noticing. The fix takes about an afternoon and costs under $50 in most homes.

This guide walks through the five spots that matter most, in order of impact. Start at the top and work down — most people see 80% of the savings after the first two steps.

Step 1: Find the actual leaks (10 minutes)

On a cold or windy day, walk around the home and hold your hand near these locations:

• The bottom and sides of every exterior door
• Where window frames meet the wall
• Electrical outlets on exterior walls
• The frame around any window AC unit
• Attic hatches and basement doors

If you feel air, that's a leak. If you can't feel anything with your hand, use a lit incense stick or a piece of tissue paper — even subtle movement is visible. Make a list. This is what you'll fix.

Step 2: Door draft stoppers (biggest single fix, ~$20)

The bottom of an exterior door is almost always the largest single leak in a home. A quarter-inch gap under a standard 36-inch door is equivalent to a 2-square-inch hole in your wall — and it's open 24 hours a day, all year.

Two options:

• Slide-on door sweep — $10–$20. Attaches to the bottom of the door with two screws. Permanent, nearly invisible, very effective. Not ideal if you rent and can't drill.
• Fabric draft snake — $5–$15. Sits on the floor against the door. No tools, no installation, no damage. Slightly less effective but works for most homes.

For the sides of the door, replace any worn weatherstripping. A $10 kit includes adhesive-backed foam or rubber strips you press into the door frame. Peel, stick, done. Takes five minutes per door.

Step 3: Window frames and sashes (~$50)

Windows leak in two places: between the frame and the wall, and between the moving sash and the frame. Both are worth fixing.

Frame-to-wall gaps

These show up as the caulk line on the interior trim. Over time the caulk dries and cracks. Scrape out the old material with a putty knife, then apply a fresh bead of paintable acrylic caulk. Cost: $6–$10 for a tube that does 3–4 windows. Time: 15 minutes per window plus overnight drying.

Sash-to-frame leaks

On older double-hung windows, this is where most of the loss happens. Adhesive foam weatherstripping is the cheap fix. Self-adhesive V-strip (also called V-seal) is more durable and slides into the gap without removing the window. Cost: $8–$15 per window.

For single-pane windows that rarely open

Removable window film is the best answer. It's a clear plastic sheet you apply to the interior frame with double-sided tape, then shrink tight with a hair dryer. Once installed, it's nearly invisible and stops almost all air movement through the glass area. Cost: $10–$25 per window. Comes off easily in spring without damaging paint.

Step 4: The two spots nobody thinks about (~$10)

Electrical outlets on exterior walls

The boxes behind your outlets have small gaps where air flows freely from inside the wall cavity into the room. Foam gaskets — thin insulating pads that sit between the outlet and the wall plate — cost about $5 for a pack of ten. Unscrew the plate, insert the gasket, screw back. Ten seconds per outlet. Do every outlet and switch on an exterior wall.

Attic hatches and basement doors

If your attic access is a hatch inside the house, that's a 2×3-foot hole in your insulation layer, often unsealed. A simple insulated hatch cover ($30–$60) or a piece of rigid foam board cut to fit stops the leak. Basement doors benefit from the same weatherstripping you used on exterior doors.

Step 5: Verify the fix worked (5 minutes)

After everything is installed, wait for a windy day and repeat the survey from Step 1. You should feel nothing at the locations you treated. If you still feel air, the seal isn't tight — either the weatherstripping isn't compressed enough, or you missed a gap under the door.

A more rigorous test: read your electricity meter, wait one week, read it again. Compare against the same week from last year. A sealed home typically sees a 5–8% drop in usage immediately, more visible during heating and cooling seasons.

What it costs and what it saves

Total cost for a typical two-door, six-window home:

• Door sweeps (2): $20–$40
• Door weatherstripping (2): $20
• Foam weatherstripping for windows (6): $50–$90
• Window film kits (3): $30–$75
• Caulk and putty knife: $15
• Outlet gaskets: $5

Realistic total: $60–$150 depending on how many windows and doors you have. Annual savings: $80–$250, usually visible within the first heating or cooling season. Payback: under one year, often under one season.

Frequently Asked Questions