HVAC Questions Answered

How much does furnace repair cost in Toronto and Mississauga?

Most furnace repairs range from $150 to $600 depending on the part. A flame sensor cleaning costs $150–$200, an igniter replacement runs $200–$300, and a gas valve replacement is typically $350–$600. EcoFrost charges $0 overtime. The same flat rate applies evenings, weekends, and holidays across the GTA.

What AFUE rating should I look for in a new furnace in Ontario?

For Ontario's climate, look for a minimum 96% AFUE furnace. That means a high-efficiency furnace converts 96 cents of every dollar in gas straight into heat. Two-stage or modulating models (96–98% AFUE) provide better comfort and lower gas bills versus single-stage units. We recommend at least 96% AFUE for all new installations.

How often should I replace my furnace filter?

Standard 1-inch filters should be replaced every 1–3 months. Thicker 4-inch or 5-inch media filters last 6–12 months. A clogged filter is the single most common cause of furnace breakdowns, starving the heat exchanger of airflow and triggering the high-limit safety switch.

My furnace makes a loud bang at startup. What causes that?

A loud bang at startup is almost always delayed ignition: gas builds up in the burner before the igniter fires, then ignites all at once. It's usually caused by dirty burners. Left untreated, it can crack the heat exchanger. Book a tune-up to have the burners cleaned before the next heating season.

What does a furnace red tag mean?

A red tag means a licensed gas technician has found a safety issue: typically a cracked heat exchanger, gas leak, or improper venting. The furnace is shut off and cannot legally be restarted until repaired by a TSSA-licensed contractor. EcoFrost specializes in red tag removal with same-day diagnosis.

Should I repair or replace my furnace?

A useful rule: if the repair cost exceeds 50% of replacement cost AND the unit is over 12–15 years old, replacement is the smarter financial choice. Older furnaces lose efficiency over time. A new 96% AFUE unit can cut your gas bill by 20–30% versus a degraded older system. EcoFrost gives you a transparent repair vs. replace comparison.

How long does a furnace last in Ontario?

A well-maintained gas furnace typically lasts 18–25 years in Ontario. Annual tune-ups are the biggest factor. Systems that skip maintenance often fail in 12–15 years. Heat exchangers and control boards are the most common failure points in older units.