Ontario’s extreme seasons — freezing winters and humid summers — put serious demands on your HVAC system. Regular maintenance is the difference between a system that lasts 20 years and one that fails at 12. Here’s your complete seasonal maintenance checklist.

Every Month

• ✅ Check and replace furnace filter (1″ filters every 30 days; 4″ filters every 3–6 months)
• ✅ Visually inspect furnace for rust, moisture, or unusual sounds
• ✅ Ensure all vents are open and unobstructed

Spring Checklist (Before AC Season)

• ✅ Schedule professional AC tune-up
• ✅ Clean debris from around outdoor AC unit (maintain 2ft clearance)
• ✅ Check refrigerant lines for ice or damage
• ✅ Test thermostat in cooling mode
• ✅ Clean or replace AC filter
• ✅ Check condensate drain line — flush with water/vinegar
• ✅ Inspect ductwork for visible damage or leaks

Fall Checklist (Before Heating Season)

• ✅ Schedule professional furnace tune-up (most important maintenance of the year)
• ✅ Replace furnace filter
• ✅ Test furnace — turn on early to catch issues before cold weather
• ✅ Check CO detectors — replace batteries
• ✅ Inspect flue pipe for blockages or damage
• ✅ Clear area around furnace — maintain 3ft clearance
• ✅ Check heat exchanger (technician only) for cracks
• ✅ Bleed radiators if you have a boiler system

Why Annual Professional Tune-Ups Matter

A professional HVAC tune-up typically costs $100–$200 and can save you thousands by catching problems early — a cracked heat exchanger (CO risk), failing capacitor, refrigerant leak, or blocked flue can all be found and fixed cheaply before they become emergencies.