Ottawa winters are among the harshest in Canada for residential homes. Temperatures dropping to -35°C, 200+ cm of annual snowfall, ice storms, and 5+ months of freeze-thaw cycles mean that fall preparation isn't optional — it's essential for protecting your home and preventing costly winter emergencies.
Ottawa winters are among the harshest in Canada for residential homes. Temperatures dropping to -35°C, 200+ cm of annual snowfall, ice storms, and 5+ months of freeze-thaw cycles mean that fall preparation isn't optional — it's essential for protecting your home and preventing costly winter emergencies. The window for fall maintenance is September through mid-November. After that, frozen ground, snow cover, and cold temperatures make many tasks impossible or significantly more expensive. A well-winterized home is warmer, more energy-efficient, and far less likely to suffer winter damage. This checklist covers everything Ottawa homeowners need to do before the first hard freeze, typically in late October or early November.
Furnace tune-up: Schedule professional maintenance ($100–$200) in September or early October. Includes filter replacement, flame inspection, heat exchanger check, ignition system test, and safety control verification. A tuned furnace is 10–15% more efficient and far less likely to fail during a cold snap. Furnace filter: Replace or clean the filter now, and plan to replace it again in December and February. Furnaces work hardest in Ottawa winters — a dirty filter reduces efficiency by 5–15% and can cause overheating shutdowns. Heat pump inspection: If you have a heat pump (increasingly common in Ottawa), ensure the outdoor unit is clear of debris, the defrost cycle is functioning, and the backup heat source is operational. Heat pumps lose efficiency below -15°C to -20°C — your backup system is critical. Fireplace and chimney: Schedule chimney cleaning if you burn wood. Test gas fireplace ignition. Ensure the damper operates properly. Stock firewood in a covered area with good airflow (not against the house wall — fire risk and pest entry point). Programmable thermostat: Program heating schedules — lower temperature when sleeping and away, comfortable temperature when home. Smart thermostats (Nest, Ecobee) can save 10–15% on heating costs. Ecobee is Canadian-made and popular in Ottawa. Humidifier: Set furnace humidifier to 30–40% relative humidity for winter. Clean or replace the humidifier pad/panel. Proper humidity prevents dry skin, static electricity, and hardwood floor shrinkage during Ottawa's very dry winter air.
Gutter cleaning: Remove fall leaves before freeze-up. Clogged gutters cause ice dams — the most destructive winter roofing issue. Schedule professional cleaning ($150–$350) in late October after leaf fall is complete. Roof inspection: Fix any damaged shingles, flashing, or vents before winter. Winter roof repairs are emergency-rate work ($$) and temporary at best. A $500 fall repair prevents a $5,000 winter emergency. Outdoor faucets: Shut off interior shut-off valves for exterior hose bibs. Open the exterior faucets to drain remaining water. Disconnect and store garden hoses. A frozen hose bib that bursts can leak inside the wall, causing hidden water damage. Window and door sealing: Replace worn weatherstripping. Apply removable caulk or window insulation film to drafty windows. Check door sweeps and thresholds. Energy losses through poorly sealed windows and doors increase heating costs by 20–30%. Foundation vents: Close any foundation vents for winter to prevent cold air from entering the crawl space. In Ottawa's climate, open foundation vents in winter can cause frozen pipes. Exterior caulking: Re-caulk gaps around windows, doors, vents, pipes, and wire penetrations. Expanding foam for larger gaps, silicone caulk for smaller joints. This prevents heat loss and ice dam formation. Deck and patio furniture: Store outdoor furniture or cover with weather-resistant covers. Apply a wood preservative to exposed decks if not stained recently. Clear patio furniture before the first snowfall. Driveway and walkway repair: Fill asphalt cracks and seal coat before winter. Repair uneven walkway surfaces that become trip hazards under snow. Stock de-icer (calcium chloride preferred over rock salt for concrete).
Insulate exposed pipes: Pipe insulation ($1–$3 per foot) on any water pipes in unheated areas (garage, crawl space, attic, exterior walls). This $50–$200 investment prevents frozen pipes — a single burst pipe costs $5,000–$50,000 in damage. Sump pump test: Verify the sump pump operates by pouring water into the pit. Check the battery backup system — winter power outages are common in Ottawa. Replace the battery every 3–4 years. Hot water tank: Insulate older hot water tanks with a tank blanket ($30–$50). Drain a few gallons from the bottom to remove sediment. Check the temperature (49°C/120°F is recommended). Know your main shut-off: Every household member should know the location of the main water shut-off valve. In a pipe-burst emergency, shutting off water within 60 seconds vs 10 minutes is the difference between $1,000 and $50,000 in damage. Outdoor irrigation: Have irrigation systems professionally blown out ($100–$150) to prevent frozen pipes and cracked fittings. Schedule in October before freezing temperatures arrive.
Tree trimming: Remove dead branches that could fall under ice and snow weight. Trim branches within 6 feet of the house or power lines. Hire a certified arborist for large trees — insurance claims from fallen trees are among the most common in Ottawa. Leaf removal: Remove leaves from the lawn before snow cover. Leaves left under snow create dead patches and promote snow mould fungus. Mulch thin layers of leaves with the mower — free fertilizer. Garden cleanup: Cut back perennials, remove annuals, and add 2–3 inches of mulch to garden beds. Mulch protects plant roots from Ottawa's deep frost penetration. Grading check: Ensure soil still slopes away from the foundation. Add topsoil where needed. Spring snowmelt will follow the grade — water flowing toward the foundation means basement flooding risk. Snow removal preparation: Service the snowblower (oil change, spark plug, shear pins). Stock de-icer and sand. Know your snow removal contractor's number. If hiring a service, book in September — quality operators fill up by October. Outdoor lighting: Shorter days mean more reliance on exterior lighting. Replace burned-out bulbs, clean fixtures, and test motion sensors. Adequate lighting improves safety on icy walkways.
Begin in September with furnace tune-up and insulation checks. Complete exterior work (gutters, outdoor faucets, caulking) by mid-October. Finish lawn and garden cleanup by early November before the first hard freeze.
Shutting off and draining outdoor faucets. A frozen exterior faucet can burst inside the wall, causing hidden water damage that goes undetected for weeks. This takes 5 minutes and prevents thousands in damage.
DIY tasks cost $100–$300 in materials. Professional services (furnace tune-up, gutter cleaning, irrigation blowout) add $300–$700. Total: $400–$1,000, preventing $5,000–$30,000+ in potential winter damage.
Yes. Annual furnace maintenance ($100–$200) catches small problems before they cause mid-winter breakdowns (emergency furnace repair is $500–$1,500+). It also ensures safe operation — cracked heat exchangers can leak carbon monoxide.