Your heating and cooling system works hard to maintain a comfortable temperature inside your home. But if your exterior doors have worn or missing weatherstripping, all that conditioned air is quietly escaping — and outside air is sneaking in. The result is a house that never quite reaches the temperature on your thermostat, a system that runs longer than it should, and an energy bill that's higher than it needs to be.
The U.S. Department of Energy estimates that air leaks account for 25–40% of the energy used for heating and cooling in a typical home. Exterior doors are among the biggest culprits. The good news: weatherstripping is one of the cheapest and fastest home energy upgrades available. A single exterior door can be fully sealed in about an hour with $15–$25 in materials, and the savings start immediately.
How to Tell If Your Doors Need Sealing
Before buying anything, spend five minutes diagnosing your doors. Three simple tests reveal air infiltration without any special equipment. First, hold a lit candle or incense stick near the edges of a closed exterior door on a windy day — a flickering flame or wavering smoke indicates air movement. Second, slide a piece of paper under the closed door; if it slides freely with no resistance, the bottom seal has failed. Third, on a sunny day, look for daylight visible around the door frame edges from inside — visible light means significant gaps.
Pay particular attention to the bottom of the door (the most common failure point), the latch side (which moves every time the door opens), and any corners where the weatherstripping pieces meet. These are the spots most likely to show wear first.
Which Type of Weatherstripping to Use Where
Not all weatherstripping is equal, and using the wrong type in the wrong location is the number one reason DIY weatherstripping jobs fail within a year. Here's the right product for each location.
| Location | Best Type | Lifespan | Cost |
|---|---|---|---|
| Door sides & top | V-strip (tension seal) | 5–10 years | $8–$15/door |
| Door bottom | Door sweep (rubber/silicone) | 3–7 years | $10–$20 |
| Minor gaps | Foam tape (self-adhesive) | 1–2 years | $5–$10 |
| Threshold | Door threshold seal | 5–10 years | $15–$30 |
For most exterior doors, the best approach is to combine V-strip weatherstripping on the door sides and top with a door sweep on the bottom. This addresses the two biggest sources of air infiltration with materials that last years without replacement. Foam tape is fine for a window or an interior door, but it compresses and degrades too quickly for a heavily used exterior door.
Best Weatherstripping Products to Buy
Here are two products that cover everything you need to fully seal a standard exterior door for under $25 total.
🥇 Duck Brand Self-Stick Foam Weatherstrip Seal (V-Strip, 17 ft)
Duck Brand's V-strip weatherstripping is the most reliable self-adhesive option for door sides and tops. The V-shaped profile springs open when the door closes, creating a consistent seal that doesn't flatten out over time the way foam tape does. The adhesive holds firmly to clean wood, metal, and painted surfaces, and the 17-foot roll covers one standard exterior door completely with material to spare. Non-toxic, paintable, and easy to cut with scissors. This is the right starting point for any door sealing project.
Check Price on Amazon🥈 Suptikes Door Draft Stopper with Silicone Seal (36-inch Door Sweep)
The Suptikes door sweep covers the most important gap — the bottom of the door — with a dual-layer design that includes both a rubber wiper and a silicone seal strip. It installs by screwing directly into the bottom edge of the door (hardware included) and accommodates minor floor irregularities thanks to the flexible silicone. Available in 36-inch and 38-inch sizes to fit most standard exterior doors, and works on both wood and metal doors. Unlike stick-on foam draft stoppers, this won't peel off after a few seasons.
Check Price on Amazon"You can reduce your heating and cooling costs by up to 30% by reducing air leaks and adding insulation." — U.S. Department of Energy
How to Install Weatherstripping: Step by Step
Installing V-strip weatherstripping on a door takes about 45 minutes the first time. Here's the complete process:
- Clean the door frame. Wipe down the surfaces where the weatherstripping will adhere with a damp cloth. Let it dry completely — adhesive bonds best to clean, dry surfaces.
- Measure each side. Measure the height of each side jamb and the width of the top jamb. Cut your V-strip to length with scissors or a utility knife.
- Peel and stick. Starting at the top corner, press the V-strip into the door stop (the narrow strip of wood the door closes against), with the open end of the V facing outward toward the exterior. Work down each side, pressing firmly.
- Install the door sweep. Close the door and mark where the bottom of the door meets the floor. Screw the door sweep to the door bottom so the rubber seal makes light contact with the threshold when closed. You want contact, not drag.
- Test the seal. Close the door and repeat your candle or paper test. You should feel no air movement and the paper should offer noticeable resistance.
Frequently Asked Questions
How much can weatherstripping save on energy bills?
The U.S. Department of Energy estimates that sealing air leaks can save 10–20% on heating and cooling costs. For a home spending $150/month on energy, that's $180–$360 per year across the whole house. Weatherstripping exterior doors specifically typically accounts for $100–$200 of those savings depending on the number of doors and your climate.
What is the best type of weatherstripping for exterior doors?
For the door sides and top, V-strip (tension seal) weatherstripping is the most durable and effective — it springs open to fill gaps as the door closes. For the bottom gap, a door sweep with a rubber or silicone seal is the best choice. Foam tape works for minor gaps but compresses over time and needs replacement every 1–2 years.
How do I know if my doors need weatherstripping?
Three easy tests: hold a lit candle near the door edges on a windy day — a flickering flame means air is leaking in. Slide a piece of paper under the closed door — if it slides freely, the bottom seal has failed. On a sunny day, look for light coming through the door frame edges from inside — visible light means significant air infiltration.
Disclosure: As an Amazon Associate, EcoThrift Home earns from qualifying purchases. Links marked as affiliate links have no effect on the price you pay, and we only recommend products we believe provide genuine value. Read our full disclosure.