Complete Home Winterization Checklist

The goal: prevent frozen pipes, heat loss, and storm damage before the first hard freeze. Most homeowners miss weatherstripping and gutter cleaning—both are cheap and save hundreds in repairs.

Critical (Do These First)

1. Drain outdoor faucets and hoses — shut off interior shut-off valve, open faucet to release water. Left full, they freeze and burst pipes inside.
2. Check furnace — change filter, schedule professional tune-up if over 1 year since last service.
3. Seal air leaks — caulk around windows, doors, outlet boxes. Use thermal camera to spot heat loss (shows cold spots as purple/blue).
4. Inspect roof and gutters — remove leaves, check for missing shingles, secure gutters. Ice dams form in clogged gutters.
5. Weatherstrip doors — gaps under doors let 10-15% of heating escape. Replace with adhesive-backed foam or door sweeps.

Important (Second Priority)

1. Insulate exposed pipes under sinks and in basements with foam sleeves.
2. Test sump pump and backup battery system.
3. Trim tree branches 6+ feet from roof to prevent ice/snow damage.
4. Flush water heater to remove sediment (improves efficiency 10-15%).
5. Check attic insulation — R-50+ recommended in Canada; gaps = heat escape routes.
6. Inspect weatherstripping on garage doors.
7. Reverse ceiling fans to push warm air down (winter mode).

Nice-to-Have (Optimization)

1. Install smart thermostat for automated heating schedules.
2. Add insulating window film or thermal curtains on single-pane windows.
3. Install heated tape on roof edges if you have a history of ice dams.
4. Caulk basement rim joists (where foundation meets sill plate).

Pro tip: The cheapest winterization is done in fall (October–November). Once winter hits, emergency repairs cost 2–3× more, and contractors are booked solid. A $30 tube of caulk prevents a $3,000 water damage claim.