How to Seal Drafty Windows and Doors Before the Chill Sets In

As temperatures drop, keeping your home cozy and energy-efficient becomes a top priority. Drafty windows and doors are often the culprits behind high energy bills and chilly indoor spaces. By sealing gaps and cracks before the cold weather sets in, you can enhance comfort while saving money. With just a few simple steps, you’ll create a snug, draft-free home ready for winter.

1. Inspect and Identify Problem Areas

Weatherstripping in front of a window sill.
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Before making repairs, take time to assess where drafts are coming from. Use your hands to feel for cold air or light a candle to detect drafts by watching the flame flicker. Common areas include gaps around window frames, door thresholds, and worn or missing weatherstripping.

Once you’ve identified problem areas, make a list to prioritize repairs. Drafty spots may seem minor, but even small gaps can significantly impact your home’s heating efficiency. A thorough inspection ensures you don’t miss anything, saving you time and money in the long run.

2. Replace or Add Weatherstripping

Person pushing in a window seal into window frame.
Photo Credit: Canva Pro

Weatherstripping is a simple yet highly effective solution for sealing gaps around windows and doors. Depending on the location and type of gap, you can choose from adhesive foam strips, V-seal weatherstripping, or door sweeps.

Remove old, worn weatherstripping and clean the area to ensure proper adhesion. Measure and cut the new material to fit snugly, sealing off drafts completely. Installing weatherstripping is an easy DIY project that can dramatically improve your home’s insulation.

3. Seal Cracks with Caulk or Sealant

Person using tape on window frame.
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Caulk is your best friend for cracks around window frames or door edges. Choose a silicone-based caulk for exterior applications or acrylic caulk for indoor repairs.

Apply the caulk evenly to fill gaps, smoothing it out with a finger or caulking tool for a clean finish. Allow it to dry completely before testing for drafts. Sealing these gaps not only prevents cold air from entering but also blocks moisture, preventing further damage.

4. Install Window Film or Insulation Kits

Closeup of someone's hands installing a window seal to an open window.
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If your windows are a significant source of heat loss, consider applying window film or using insulation kits. These kits include a clear plastic film that shrinks tightly over your windows with a hairdryer, creating an additional barrier against the cold.

Window film is an affordable and temporary solution, especially for older, single-pane windows. It helps retain heat and reduces condensation, making your home feel more comfortable during the winter months.

5. Upgrade Door Thresholds and Seals

Workers resealing window fronted by an assortment of tools.
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Doors are a common source of drafts, particularly at the bottom. Replace old door sweeps with new ones, or install draft stoppers for an even more secure seal. For gaps at the sides or top, consider adding a door gasket.

Check the door threshold for wear and tear. If it’s damaged or uneven, replace it with a new, adjustable threshold. Properly sealed doors can significantly reduce drafts, improving overall energy efficiency.

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Taking the time to seal drafty windows and doors before winter not only keeps your home warm but also helps reduce energy costs. These simple DIY fixes can make a noticeable difference in your comfort and budget. With a little preparation, you’ll be ready to enjoy a cozy, draft-free home all season long.

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