Quick Answer
Most AC repairs in the GTA run $150 to $800, depending on the part. A capacitor or contactor sits at the low end ($150–$350), while a fan motor, control board, or refrigerant leak repair lands at the higher end. Expect a $90–$150 diagnostic fee, usually credited toward the repair if you proceed. Repairs above roughly half the cost of a new system rarely make sense on an aging unit.
AC repair costs in the Greater Toronto Area depend almost entirely on which component failed. A failed start capacitor and a failed compressor are both "my AC won't cool," but one is a $250 fix and the other can cost more than the unit is worth. Here's a realistic price-by-problem breakdown so a quote you receive makes sense in context.
The diagnostic fee
Almost every GTA company charges a service-call or diagnostic fee of $90–$150 to send a licensed technician, test the system, and identify the fault. Reputable shops credit that fee toward the repair if you approve the work. Be wary of "free" diagnostics that are simply baked into inflated repair prices.
Common AC repairs and what they cost
- Capacitor replacement: $150–$350 — the single most common AC repair, and an easy, fast fix
- Contactor replacement: $150–$350 — the relay that switches the condenser on; pitted contacts cause no-starts
- Condenser or blower fan motor: $300–$700 — parts plus labour, depending on the motor type
- Refrigerant leak repair and recharge: $300–$800+ — finding and sealing the leak costs more than the refrigerant itself, and modern refrigerant is pricey
- Control board replacement: $400–$800 — common on newer units with electronic boards
If your AC is short on refrigerant, resist a simple "top-up." A sealed system shouldn't lose refrigerant, so a low charge means there's a leak — and recharging without fixing it just pays for the same problem twice. Low charge is also a top cause of an AC freezing up and an AC that won't cool.
When repair stops making sense
- The unit is 12+ years old AND faces a repair over $800 — replacement usually wins on total cost of ownership
- The compressor or evaporator coil has failed — these are the most expensive components and often signal more failures coming
- You've paid for repairs in two or more consecutive summers — recurring bills add up to a new system fast
- The system uses older R-22 refrigerant, which is phased out and now very expensive to source
A common rule of thumb: if the repair costs more than half the price of a new system and the AC is past 10 years old, lean toward replacement. Our repair vs. replacement guide walks through the math, and how long an AC lasts in Canada helps you judge where yours sits.
If your AC has quit during a GTA heat wave, ZK Mechanical offers same-day diagnostics and 24/7 emergency service — and we'll always tell you honestly when a repair is worth it versus when a replacement is the smarter spend. Book a technician or call +1 647-801-1252.
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