Unlike a furnace that sits idle from May to October, your heat pump runs 12 months a year - cooling in summer, heating in winter, dehumidifying in shoulder seasons. That year-round operation means maintenance cannot be seasonal afterthought. A properly maintained heat pump lasts 15 to 20 years and runs 25 to 40% more efficiently than a neglected one.
Monthly Tasks (Year-Round)
- Check air filter - replace 1-inch filters monthly, 4-inch media filters every 3 to 6 months
- Inspect thermostat settings and verify correct operation
- Check outdoor unit for debris accumulation around the base
- Listen for new noises: rattling, grinding, or squealing that was not there before
Spring Maintenance Checklist (March - April)
Spring is the ideal time to service a heat pump before the summer cooling season. The system has just come off heating mode and is ready for inspection.
- Clean outdoor unit coil with garden hose (inside-out direction)
- Clear at least 18 inches of clearance on all sides of outdoor unit
- Inspect refrigerant line insulation - replace if cracked or deteriorated
- Test cooling mode - confirm cold air within 10 minutes of startup
- Check condensate drain line - pour water to confirm it flows freely
- Inspect ductwork connections in accessible areas for loose seals
- Test emergency heat / auxiliary heat strips to confirm function
Summer Maintenance Checklist (June - August)
- Monitor condensate drain line monthly - clear any algae buildup with a bleach tablet
- Keep plants and vegetation trimmed back at least 2 feet from outdoor unit
- Watch for unusual spikes in energy bills indicating reduced efficiency
- Check that supply and return vents are unobstructed
- Listen for a gurgling sound which may indicate low refrigerant
Fall Maintenance Checklist (September - October)
Fall maintenance prepares the heat pump for the transition to heating mode - the hardest working period in a Toronto winter.
- Test heating mode before temperatures drop below 5°C
- Clean leaves and fall debris from outdoor unit thoroughly
- Inspect defrost cycle operation - confirm unit defrosts and returns to heating mode
- Check weatherstripping and insulation on refrigerant lines outside
- Book professional annual tune-up (refrigerant check, electrical inspection)
- Test carbon monoxide and smoke detectors
- Program thermostat for heating season schedule
Winter Maintenance Checklist (November - March)
- After snowfall: clear snow from around unit (keep 18" clearance on sides)
- Check for ice buildup - light frost is normal, heavy ice is not
- Do not use sharp tools on ice - wait for defrost cycle
- Keep dryer vents, exhaust fans, and vents clear of snow drifts
- Monitor supply air temperature: should be 18 to 25°C above indoor temp in heating mode
- Check that auxiliary/emergency heat kicks in properly on coldest days (-15°C and below)
At -15°C and below, a cold-climate heat pump will still produce heat but runs its auxiliary electric strips more frequently. This is normal. If your heat pump is not a cold-climate model (HSPF2 below 7.5), efficiency drops significantly below -10°C.
What a Professional Heat Pump Tune-Up Includes
- Refrigerant charge measurement and top-up if required
- Electrical connections inspection and tightening
- Capacitor and contactor testing
- Coil cleaning (evaporator and condenser)
- Defrost board and sensor testing
- Thermostat calibration and staging verification
- Full heating and cooling mode performance test
- Safety controls inspection
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?Frequently Asked Questions
How often should a heat pump be serviced in Toronto?
Heat pumps should receive a professional tune-up once a year - ideally in spring before the cooling season or fall before the heating season. Because heat pumps run year-round (unlike a furnace or AC that only operates one season), annual servicing is essential to catch wear before it becomes a failure.
Why does my heat pump ice up in winter?
Light frost on the outdoor unit in winter is completely normal. Heat pumps have an automatic defrost cycle that melts this frost every 30 to 90 minutes. Heavy ice accumulation that does not clear after a defrost cycle, or ice covering the entire coil, indicates a problem such as low refrigerant, a faulty defrost sensor, or blocked airflow. Call a technician if ice buildup persists.
How do I clean my heat pump's outdoor unit?
Turn the thermostat to "off" and switch off the outdoor disconnect. Remove large debris by hand. Rinse the fins with a garden hose on gentle spray, working from inside the unit outward. Do not use a pressure washer - it can bend the fins. Let dry before restoring power. Never spray water into electrical components.
Should I cover my heat pump in winter in Toronto?
No. Never cover the outdoor unit in winter. Heat pumps operate in heating mode throughout the winter and need constant airflow. Covering the unit can cause the compressor to overheat and fail. You can install a roof-style cover above the unit (not around the sides) to keep snow off the top if desired.
How much does a professional heat pump service cost in Toronto?
A professional heat pump tune-up in Toronto typically costs $120 to $200 for a standard annual service visit. This includes refrigerant charge check, electrical inspection, coil cleaning, defrost board testing, and a full performance test in both heating and cooling mode. EcoFrost offers heat pump maintenance plans starting at $149 for GTA homeowners.
Can I do heat pump maintenance myself or should I hire a professional?
Homeowners can safely handle monthly tasks like changing air filters, clearing snow and debris from around the outdoor unit, and rinsing the outdoor coil with a garden hose. However, tasks involving refrigerant levels, electrical components, capacitor testing, and defrost board diagnostics require a licensed HVAC technician. Attempting refrigerant work without a proper licence is illegal in Ontario.
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