How to Find and Fix Drafty Windows — DIY Guide
Drafty windows waste energy and make rooms uncomfortable. Learn how to detect air leaks and seal them yourself in under an hour.
Are Your Windows Costing You Money?
Drafty windows are one of the most common — and most fixable — energy problems in any home. A single poorly sealed window can let in as much cold air as leaving a door open a few inches.
How to Detect Window Drafts
There are a few simple tests you can do yourself:
- The hand test: Hold your hand near window edges on a cold day. Feel for cool air movement.
- The candle test: Hold a lit candle near the window frame. If the flame flickers, there's a draft.
- Thermal imaging: A HomeBoost thermal scan shows exactly where cold air is entering — no guesswork.
Quick Fixes That Work
Weatherstripping
Self-adhesive weatherstripping is cheap and easy to apply. Clean the frame, measure, cut, and press into place. It works for both windows and doors.
Caulking
For gaps between the window frame and wall, a bead of caulk creates a permanent seal. Use paintable silicone for a clean finish.
Window Film
Heat-shrink window film adds an insulating layer for winter. It's removable in spring and costs under $5 per window.
When to Call a Pro
If your windows are single-pane, cracked, or severely warped, sealing won't be enough. Replacement may be the better long-term investment — and many utilities offer rebates for energy-efficient window upgrades.
Next Steps
Want to see exactly where your home is losing energy? Try a HomeBoost DIY energy assessment — it takes 30 minutes and shows you every draft, leak, and insulation gap.