How to prepare your home for winter: doors and windows

Inspect your weatherstripping

Weatherstripping and caulking are the first line of defence against the cold. Over time they dry out, crack or peel away. Run your hand along the frame of each window and door: if you feel a draft, it is time to replace them.

Tip: foam weatherstripping is cheap but wears out fast. Silicone or EPDM models last several years.

Check the exterior caulking

The caulking around your frames keeps water and air out. Inspect it: if it is cracked, peeling or missing in places, lay a new bead before the first frost.

• Use a caulk designed for extreme temperatures.
• Apply in dry weather, ideally between 5 °C and 25 °C.
• Remove the old bead completely before laying the new one.

Test your locking mechanisms

A window that does not close airtight lets cold air in. Check that each one locks properly and that the cranks work. Lubricate the mechanisms with silicone so they do not freeze.

Clean the tracks and thresholds

Dirt, leaves and debris built up in sliding window tracks and door thresholds prevent an airtight close. An autumn cleaning keeps everything working all winter.

Insulating film

For an older single-pane window, heat-shrink plastic film adds a layer of insulation cheaply. It is an effective stopgap while you wait for a replacement.

When to consider replacing

If after all that you still find drafts, condensation between the panes or excessive heating bills, preparation is no longer enough. Look then for pure uPVC frames of at least 5 5/8 in., sealed units with Swisspacer spacers, and for doors a triple magnetic compression weatherstrip. ENERGY STAR^® models with a non-degressive 20-year warranty are the most reliable over time.