Quick Answer
Okay, so here's the quick version on drafty windows. Nine times out of ten, it’s just shot caulk or worn-out weatherstripping. You can fix most of this yourself for under $50 with a trip to the hardware store for some good caulk and new seals. I’ll walk you through how I find the leaks – sometimes it’s as simple as just using your hand. If the problem's bigger, like a busted window frame or fog between the panes, then you might need to call someone in. But always, and I mean always, start with the simple stuff first.
Common Symptoms
Possible Causes
Step-by-Step Diagnosis
Step 1
Visual Inspection - Go outside and check the exterior caulk for cracks. Then, inside, examine the weatherstripping for compression or damage.
Step 2
Hand Test - On a cold day, move the back of your hand slowly around the window perimeter to feel for cold spots.
Step 3
Incense Stick Test - Light an incense stick and hold it near the window seals; watch if the smoke is disturbed, indicating a draft.
Step 4
Dollar Bill Test - Close and lock the window on a dollar bill. If you can pull it out easily, the seal is not tight enough.
Step 5
Flashlight Test - At night, have someone shine a bright flashlight on the exterior frame while you look for light leaks from inside.
DIY vs Professional Costs
| Repair Type | DIY Cost | Professional Cost | Time Required |
|---|---|---|---|
Re-Caulking Exterior Frame | $10-40 | $100-250 per window | 1-2 hours |
Replacing Weatherstripping | $20-60 | $120-280 per window | 1-3 hours |
Window Film Insulation Kit | $15-40 | N/A | 1 hour |
When to Call a Professional Handyman
- When you've tried all the DIY fixes (caulk, weatherstripping) and the draft persists.
- If you see moisture or fog trapped between the panes of a double-pane window, as this means the seal has failed.
- When you find significant wood rot, cracks in the vinyl frame, or other structural damage to the window.
- For any windows that are on a second story or otherwise difficult and dangerous to reach from the outside.
- If you want a professional energy audit with a blower door test to find all possible air leaks in your whole house.
Prevention Tips
- Annually inspect your exterior window caulk in the fall and re-apply as soon as you see cracks forming.
- Check your weatherstripping for signs of compression or brittleness each year and replace it before it fails completely.
- Always make sure your windows are fully locked when closed to ensure the sash is pulled tight against the seals.
- Consider adding insulated curtains for an extra thermal barrier during extreme weather months.
Frequently Asked Questions
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