Annual HVAC Maintenance Schedule for Calgary Homeowners
Calgary's climate demands more from heating systems than most Canadian cities. The extended heating season (October through April), extreme temperature swings from chinook events, and dry air all accelerate wear. This month-by-month checklist keeps your system reliable year-round.
September — Pre-Heating Season (Most Important Month)
- ✅ Book furnace tune-up — September books fast. Don't wait until October when the cold arrives.
- ✅ Replace furnace filter — Fresh filter at the start of heavy-use season.
- ✅ Test the thermostat — Switch to heat mode, confirm it fires up correctly.
- ✅ Replace humidifier water panel — Before the dry season starts.
- ✅ Check all vents are open — Closing vents increases static pressure and stresses the blower.
- ✅ Test carbon monoxide detectors — Replace batteries. CO risk rises as furnaces run more.
- ✅ Inspect furnace flue pipe — Look for rust, gaps, or bird nests in the exterior exhaust cap.
October–February — Heating Season
- ✅ Check filter monthly — Heavy use months load filters faster. Replace when visibly grey.
- ✅ Monitor humidity levels — Target 35–40% RH. Adjust humidistat as outdoor temps drop.
- ✅ Listen for new sounds — Banging, squealing, or rumbling during startup or operation warrants a service call.
- ✅ Keep outdoor exhaust vents clear — Snow and ice can block high-efficiency furnace exhaust pipes, causing lockout.
- ✅ During extreme cold: check pipes near exterior walls — If the furnace struggles, interior temperatures near exterior walls can drop enough to freeze pipes.
Calgary chinook warning: Rapid temperature swings during chinooks cause expansion and contraction in ductwork — this is normal (popping sounds). But if the furnace short-cycles during a chinook, the rapid temperature changes may be causing a high-limit switch trip. Call for service.
March–April — End of Heating Season
- ✅ Book AC tune-up — April is the ideal time. Before summer rush, while parts are available.
- ✅ Turn off humidifier — Switch humidistat to summer/off setting to prevent mould growth.
- ✅ Change filter — End-of-season filter change gives a clean start to shoulder season.
- ✅ Inspect furnace flame colour — Should be blue. Yellow or orange warrants inspection before next season.
May–June — Cooling Season Prep
- ✅ AC tune-up — Check refrigerant, clean coils, test all components.
- ✅ Clean around outdoor AC unit — Remove debris, trim vegetation to 2 feet clearance.
- ✅ Test AC before first heat wave — Run for 15 minutes on a warm day. Confirm cooling output.
- ✅ Check condensate drain — Pour water down the drain line to confirm it flows freely.
Annual Professional Services
| Service | When | DIY or Pro? |
|---|---|---|
| Furnace tune-up | September | Professional |
| AC tune-up | April–May | Professional |
| Duct cleaning | Every 3–5 years | Professional |
| Humidifier water panel | September | DIY or professional |
| Filter replacement | Monthly to quarterly | DIY |
| CO/smoke detector test | Monthly | DIY |
| Water heater anode rod | Every 3–5 years | Professional |
| Water heater sediment flush | Annually | DIY or professional |