Why Is My AC Not Cooling in Ottawa? 9 Quick Fixes
If your AC is not cooling in Ottawa, don’t panic. Try these fast checks before booking a repair—and learn when it’s time to call a pro.
Quick DIY Checks
- Thermostat mode: Set to Cool, fan Auto, temperature a few degrees below room temp.
- Air filter: Replace if dirty—restricted airflow = weak cooling.
- Breaker: Confirm outdoor condenser and furnace/air handler breakers are on.
- Outdoor unit: Clear leaves/debris; keep 60 cm of open space for airflow.
- Vents: Open supply/return grilles; don’t block with furniture or rugs.
- Coil frost: Ice on lines? Turn system Off and run Fan 2–3 hours to thaw.
Common Causes in Ottawa Summers
- Low refrigerant: Usually a leak; needs a licensed tech.
- Dirty coils: Ottawa pollen/dust clog fins and reduce heat transfer.
- Failed capacitor or fan motor: Outdoor fan not spinning or hard starting.
- Undersized system: Struggles on humid days; consider a right-sized replacement.
When to Call a Pro
Warm air from vents, frequent tripping breakers, iced lines that return, or a silent outdoor unit usually require service.
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Prevent It Next Time
Change filters quarterly, keep vegetation away from the condenser, and schedule spring maintenance. Consider a cold-climate heat pump if your AC is aging—cooling in summer and efficient heating in winter.
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