Toronto Commercial HVAC repairs packaged rooftop units for retail plazas, offices, restaurants, warehouses and industrial buildings across Toronto and the GTA. We work on every major brand from 3 to 150 tons: Trane Voyager, Carrier 48TC, York Predator, Lennox Landmark, Daikin Rebel and AAON RN. With 1,400+ RTUs under contract, we see the same failures over and over and stock trucks to match.
Rooftop units fail in patterns. On the cooling side: contactors pit, capacitors weaken, condenser fan motors seize, microchannel coils foul and compressors trip on high head pressure. On the air side: belts glaze, blower motors fail and economizer actuators stick. On the heating side: igniters crack, inducers fail and heat exchangers develop cracks. Water problems come from plugged drains and failed seals at the roof adapter.
RTU repairs typically cost $450 to $5,500, plus a $185 diagnostic waived on repairs over $750. Emergency parts cover about 80% of the Toronto commercial RTU fleet, so most repairs close on the first visit.
What Does Rooftop Unit Repair Cover?
Cooling section
Compressors, condenser fan motors, contactors, capacitors, TXVs, coils and refrigerant leaks. For split systems and VRF, see commercial AC repair.
Air section
Blower motors (belt and ECM), belts and pulleys, filters, dampers and economizers. Economizer faults are one of the most common and most ignored problems on Toronto RTUs.
Heating section
Igniters, flame sensors, inducers, gas valves, limits and heat exchangers. Gas heat faults are covered in detail on our commercial furnace repair page.
Controls
Unit controllers, thermostats, sensors and BAS communication. A bad discharge air sensor can make a healthy unit look broken.
RTU Repair Cost Guide
| Repair | Typical range |
|---|---|
| Diagnostic | $185 (waived over $750) |
| Contactor, capacitor, relay | $450-$750 |
| Condenser fan motor | $650-$1,500 |
| Belt and pulley service | $450-$900 |
| Economizer actuator or sensor | $750-$1,800 |
| ECM blower motor | $1,400-$3,200 |
| Scroll compressor (up to ~25 tons) | $3,500-$5,500 |
| Heat exchanger | $1,800-$5,000 |
Signs Your Rooftop Unit Needs Repair
- Warm air in cooling mode, or cold air in heating mode.
- Short cycling or frequent lockouts.
- Water stains or drips below the unit.
- Grinding, squealing or rattling from the roof.
- Energy use climbing without a change in occupancy.
- The economizer damper is stuck wide open or shut.
Rooftop Safety
Every RTU repair follows our fall-arrest protocol: anchors and lanyards, edge protection near drop-offs, ladder tie-offs and Working at Heights certified technicians. In winter we clear snow and ice around the unit before work starts. If your roof has no anchors, we bring a portable system.
Repair or Replace Your RTU?
Repair is usually the right call on units under 15 years. Once an RTU passes 18-22 years, runs on R-22 or has a cracked heat exchanger, we quote rooftop unit installation side by side with the repair so the decision is clear.
RTU Repair Across Toronto and the GTA
Our RTU crews cover Dixie-Mavis and Pearson-area industrial in Mississauga, Hwy 410 and Steeles in Brampton, Hwy 400 and Hwy 7 in Vaughan, The Queensway and Six Points in Etobicoke and retail plazas from Streetsville to Agincourt. Retail portfolios can bundle RTU work under our commercial HVAC for retail programs.
