How to Fix Drafty Replacement Windows: Simple DIY Solutions


Drafty windows can make your home uncomfortable and increase energy bills. Even replacement windows that are relatively new may develop drafts due to improper installation, weatherstripping wear, or frame gaps. Fortunately, there are several DIY solutions and preventive measures to stop drafts and improve energy efficiency.

1. Identify the Source of the Draft

Before fixing a draft, determine where the air is coming from:

  • Window frame gaps – Between the window and the wall.

  • Sash gaps – Between the sliding or double-hung sashes.

  • Weatherstripping wear – Old or damaged seals.

  • Glazing or caulk issues – Cracked or missing sealant around the glass.

A simple test: hold a lit incense stick or candle near the edges of the window; movement of the smoke indicates air leakage.

2. Quick DIY Draft-Fixing Solutions

A. Replace or Add Weatherstripping

  • Foam tape or V-strip weatherstripping works well for sliding and double-hung windows.

  • Remove old weatherstripping, clean the surface, and apply new strips to seal gaps.

B. Apply Caulk or Sealant

  • Inspect the perimeter of the window for gaps in the caulking.

  • Use exterior-grade silicone caulk for the outside and acrylic latex caulk for the interior.

  • Smooth the caulk to ensure a tight seal.

C. Use Window Insulation Film

  • Plastic window film kits can create an extra barrier against drafts.

  • Ideal for winter months, especially if the windows are difficult to replace immediately.

D. Adjust or Tighten the Window Sash

  • Check if the sash is misaligned or loose.

  • Tightening screws or adjusting the window lock can reduce gaps between sashes.

3. Preventive Maintenance Tips

  • Inspect weatherstripping annually and replace worn strips promptly.

  • Check caulking and glazing every year, particularly after harsh weather.

  • Lubricate moving parts of sliding windows to ensure smooth closure.

  • Monitor indoor humidity; high humidity can cause wood frames to swell and gaps to shift.

4. When to Call a Professional

  • Persistent drafts despite DIY fixes

  • Warped frames or misaligned replacement windows

  • Water leaks or condensation issues

Professional window contractors can adjust, reseal, or replace components to ensure proper insulation.

5. Energy Savings Benefits

  • Properly sealing drafty windows can reduce heating and cooling costs by 10–25%.

  • Improves indoor comfort and prevents moisture problems.

  • Extends the life of your HVAC system by reducing workload.

Conclusion

Drafty replacement windows don’t have to compromise your comfort or increase energy bills. By inspecting for gaps, replacing weatherstripping, applying caulk, and performing regular maintenance, most drafts can be fixed with simple DIY methods. For severe issues, professional adjustments or resealing may be necessary to restore efficiency.

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