Toronto Commercial HVAC handles commercial HVAC repair for offices, restaurants, retail plazas, warehouses and institutions across Toronto and the GTA. We repair the whole mechanical stack: rooftop units, split systems, VRF, chillers, boilers, make-up air units and unit heaters. Our technicians hold TSSA G1 and G2 gas tickets, ESA authorization and 313A refrigeration licences, so one crew can follow a fault from the gas train to the compressor to the control board.
Most commercial breakdowns come from a short list of failure modes. Contactors pit and weld shut. Run capacitors swell and drift out of spec. ECM blower motors lose their modules after a power surge. Scroll compressors trip on high head pressure when condenser coils are packed with cottonwood. Economizer actuators stick and let hot outside air flood the building. Boiler flame safeguard controls lock out on weak flame signals. We test for the cause before we replace anything, because swapping parts until the fault goes away is the most expensive way to repair a building.
Pricing starts with a $185 diagnostic. That fee is waived when the approved repair is over $750. Typical minor repairs run $450 to $1,200, and major components run $1,200 to $5,500. After-hours calls add a $185 surcharge. You get a written quote with parts, labour, refrigerant and any lift costs listed separately before work begins.
What Does Commercial HVAC Repair Cover?
Commercial HVAC repair covers any fault that stops heating, cooling or ventilation from meeting the building’s design conditions. In practice we see four groups of equipment.
Rooftop units and split systems
Packaged RTUs from 3 to 150 tons make up most Toronto commercial calls. We repair compressors, condenser fan motors, blower motors and belts, gas heat sections, economizers and controls on Trane Voyager, Carrier 48TC, York Predator, Lennox Landmark, Daikin Rebel and AAON RN units. For RTU-specific detail, see our rooftop unit repair service.
Chillers and chilled water
Air-cooled and water-cooled chillers, pumps, valves and fan coil units. Chiller faults often show up first as tenant comfort complaints on upper floors, so we check the plant and the air side together.
Boilers and heating
Hydronic, steam and condensing boilers, unit heaters, radiant tube heaters and RTU gas heat. Gas work follows CSA B149.1, and every gas repair ends with a combustion and CO test. Boiler-specific work is covered on our commercial boiler repair page.
Ventilation and controls
Make-up air units, exhaust interlocks, VAV boxes, thermostats and BAS points. A failed actuator or a bad sensor can make healthy equipment look broken, so controls are part of every diagnosis.
When Do You Need Commercial HVAC Repair?
Call for repair when the building shows any of these signs:
- Short cycling. Units starting and stopping every few minutes point to a control, pressure or sizing problem.
- Warm or cold zones. One side of the floor is uncomfortable while the other is fine. Often a VAV box, damper or economizer.
- Lockouts and alarms. Ignition lockout, high-pressure lockout or a BAS alarm that keeps coming back after a reset.
- Rising energy bills. A 10-20% jump with no change in occupancy usually means a unit is fighting itself.
- New noises or smells. Grinding bearings, squealing belts or a gas smell. If you smell gas, leave the area and call your gas utility first.
- Water where it should not be. Ceiling stains below rooftop units mean plugged drains or failed roof adapters.
Cost Guide: Commercial HVAC Repair in Toronto
| Repair | Typical range | Notes |
|---|---|---|
| Diagnostic | $185 | Waived on repairs over $750 |
| Contactor or capacitor | $450-$750 | Usually on the truck |
| Igniter, flame sensor, pressure switch | $450-$900 | Gas heat sections and boilers |
| Condenser fan motor | $650-$1,400 | Size and voltage dependent |
| ECM blower motor | $1,200-$2,800 | Module or full motor |
| Economizer actuator and controls | $750-$1,800 | Includes sensor checks |
| Scroll compressor | $3,500-$5,500 | Plus refrigerant |
| Heat exchanger replacement | $2,800-$5,500 | Where parts are still available |
| After-hours surcharge | $185 | Evenings, nights, weekends |
Three things move the price most: access (crane, lift or roof hatch only), refrigerant type and quantity, and whether parts are stocked locally. We list each one on the quote.
Common Commercial HVAC Failures We Fix
Electrical faults
Pitted contactors, weak capacitors and loose lugs cause a large share of no-cooling calls. These are cheap parts, but a failed capacitor can take a compressor with it if it is ignored.
Refrigerant leaks
Low charge shows up as frozen evaporator coils or high discharge temperatures. We run an electronic leak search, repair the leak and pressure test before recharging. Topping up a leaking system without finding the leak only delays the next call.
Airflow problems
Plugged filters, slipping belts, failed blower motors and stuck dampers starve the coil of air. Airflow faults also crack heat exchangers on gas units, so we treat them as a safety issue as well as a comfort issue.
Control and sensor faults
Failed thermostats, bad discharge air sensors and lost BAS communication make good equipment run badly. We check the controls before condemning any major component.
Repair, Replace or Wait?
A single repair under $1,500 on a unit younger than 15 years almost always makes sense. Once a rooftop unit passes 18 years, or when one repair is more than half the cost of a new unit, we put both options in writing: repair cost, expected remaining life and the commercial HVAC replacement cost for the same unit. Many property managers use that sheet to move a unit into next year’s capital plan instead of paying for the same failure twice.
Commercial HVAC Repair Across Toronto and the GTA
Our crews work Bay Street towers, King West converted warehouses, Dixie-Mavis industrial parks, Hwy 400 distribution centres and Scarborough Junction plants every week. Because we cover 20+ GTA cities from staged crews, the 2-4 hour emergency window holds from Etobicoke to Markham. Buildings on a commercial HVAC maintenance program get priority routing and fewer repair calls in the first place.
