Commercial Rooftop HVAC Repair & Replacement
TSSA-certified rooftop unit repair, replacement, and preventive maintenance for retail plazas, restaurants, warehouses, and low-rise commercial buildings across Toronto and the GTA.
What Are Commercial Rooftop HVAC Units?
Commercial rooftop unit RTU repair Toronto — rooftop units or RTUs are self-contained heating, ventilation, and air conditioning systems installed on the roofs of commercial buildings. Unlike split systems that separate indoor and outdoor components, an RTU consolidates the compressor, condenser, evaporator, gas heat exchanger, supply fan, and controls into a single factory-assembled cabinet. This design makes rooftop units the preferred HVAC solution for single-storey and low-rise commercial properties throughout the Greater Toronto Area, including retail plazas, restaurant rows, strip malls, warehouses, and light industrial facilities. All rooftop gas work is performed in compliance with requirements set by the Technical Standards and Safety Authority.
At HVAC Touch, we specialize in rooftop HVAC repair in Toronto and the surrounding GTA. Our TSSA-certified technicians service, maintain, and replace rooftop HVAC replacement crane service GTA units on every type of commercial building. RTUs offer practical advantages: roof mounting frees valuable interior floor space, reduces noise transmission, simplifies ductwork distribution, and allows maintenance without disrupting business operations below. If you manage commercial properties and need a reliable partner for RTU repair in Toronto, our team handles everything from routine filter changes to complete unit replacements requiring crane coordination. We also offer structured RTU maintenance program commercial buildings GTA agreements and support your building's overall energy audit needs, emergency HVAC response, and preventive maintenance scheduling.
How Commercial Rooftop Units Work
The heating section of a commercial RTU uses natural gas burners to heat air passing through a heat exchanger. In Ontario, all gas-fired heating equipment must be installed, maintained, and repaired by TSSA-licensed gas technicians. Common gas heating failures include faulty gas valves, cracked igniter elements, dirty flame sensors causing nuisance lockouts, cracked heat exchangers, and induced draft motor failures. Our technicians carry replacement igniters, flame sensors, and gas valves for the most common RTU models. For buildings requiring a new commercial HVAC installation, our commercial HVAC installation team handles turnkey replacements.
The cooling section operates on the direct expansion (DX) refrigeration cycle, while most modern RTUs include an economizer section that brings in outdoor air for free cooling when conditions are favourable. Economizer malfunctions are among the most overlooked problems in outdoor condensing unit repair commercial Toronto -- a stuck-open economizer in January can double your heating bill, while a stuck-closed economizer in October forces unnecessary compressor operation. We estimate that more than half the RTUs we inspect across the GTA have economizer problems that building owners are unaware of. Review our maintenance best practices to understand how seasonal startup visits catch these issues. For complete portfolio coverage, our property management HVAC programs provide scheduled RTU service across all your buildings.
Common Rooftop Unit Problems We Repair
Gas Valve & Ignition Failures
Gas valves that fail to open or close, cracked hot surface igniters, dirty flame sensors causing lockouts, and intermittent ignition failures. All gas repairs by TSSA-licensed technicians.
Compressor Failures
Scroll and reciprocating compressor failures from electrical burnout, mechanical seizure, or end of life. We diagnose root cause before replacement to prevent repeat failures.
Economizer Malfunctions
Stuck dampers, broken actuators, corroded linkages, and faulty sensors causing uncontrolled outdoor air intake. A stuck economizer in winter can freeze coils and spike energy costs.
Belt & Bearing Wear
Squealing, chirping, or grinding noises indicating belt wear, pulley misalignment, or bearing degradation. We stock common belt sizes and bearings for same-day repair.
Control Board & Thermostat Issues
Failed main control boards, faulty thermostat wiring, communication errors, and programming issues causing erratic heating and cooling cycles across your building.
Electrical Component Failures
Contactors, capacitors, relays, transformers, and wiring faults common in older units exposed to years of rooftop weather extremes, vibration, and thermal cycling.
Need Rooftop HVAC Service Today?
Contact HVAC Touch for expert RTU repair, replacement, and maintenance across the Greater Toronto Area. TSSA-certified and available 24/7.
RTU Brands We Service & Maintenance Programs
HVAC Touch technicians are trained and experienced on all major commercial rooftop unit manufacturers including Carrier WeatherExpert and WeatherMaker series, Lennox Energence and Strategos, Trane Precedent and Voyager, York Predator and Sunline, Daikin Rebel and Maverick, and Rheem Commercial Renaissance. We maintain direct supplier relationships for OEM parts and can source components for discontinued models.
Rooftop units operate in the harshest conditions of any HVAC equipment. Our maintenance packages include Spring Cooling Startup with compressor inspection, refrigerant charge verification, condenser coil cleaning, and economizer testing. Fall Heating Startup covers gas valve testing, ignition verification, heat exchanger inspection, and combustion analysis per TSSA requirements. Quarterly Filter Changes include belt inspection, bearing lubrication, and condition assessment. Contract holders receive Priority Emergency Response with guaranteed response times. For businesses needing immediate help, rooftop package unit emergency repair Toronto dispatch is available 24/7. Buildings on our maintenance programs experience significantly fewer emergency breakdowns, lower energy costs, and longer equipment life.
Rooftop Unit Replacement & Crane Services
Commercial rooftop units typically have a service life of 15 to 20 years. We recommend evaluating rooftop unit replacement when repair costs exceed 40% of replacement cost, when the unit requires R-22 refrigerant, when the heat exchanger shows cracks or corrosion, when the compressor has failed a second time, or when energy costs have climbed noticeably. Our technicians provide honest assessments weighing repair cost against remaining equipment life, energy savings from modern units, and available utility rebates.
Replacing a commercial rooftop unit requires crane coordination. HVAC Touch manages all crane logistics including selecting appropriate crane size, obtaining municipal permits, coordinating scheduling and site access, and ensuring WSIB-compliant rigging practices. Curb adapters bridge dimension differences between old and new units, allowing secure mounting on existing roof curbs without costly structural modifications. Our replacement projects comply with Ontario Building Code requirements for structural loading, flashing, and weather sealing, and all gas connections are completed by TSSA-licensed technicians.
Energy Efficiency Upgrades & TSSA Compliance
Modern RTUs deliver substantially better energy performance than units manufactured even ten years ago. Upgrading can reduce HVAC energy consumption by 30% to 50%. Key improvements include variable speed compressors that modulate capacity to match actual load, ECM fan motors using 60-70% less energy, integrated economizers with differential enthalpy controls, condensing gas heat sections achieving 95%+ thermal efficiency, and smart controls with demand-controlled ventilation and remote monitoring.
In Ontario, the Technical Standards and Safety Authority (TSSA) regulates all gas-fired equipment. HVAC Touch ensures every gas-related service meets or exceeds TSSA requirements. Our compliance services include annual combustion analysis, heat exchanger integrity inspections, gas pressure testing, safety device verification, and proper venting inspection per CSA B149.1 and B149.2 standards. Seasonal commissioning is included in our maintenance contracts and is the single most effective way to prevent seasonal breakdowns.
Rooftop HVAC Repair FAQ
How often should commercial rooftop units be serviced?
We recommend a minimum of two comprehensive maintenance visits per year: a spring cooling startup and a fall heating startup. In addition, filters should be changed quarterly. Buildings with critical comfort requirements may benefit from monthly inspections. Regular service extends equipment life, prevents emergency failures, and maintains energy efficiency.
How long does a commercial rooftop unit replacement take?
A straightforward one-for-one RTU replacement can typically be completed in a single day. Replacements requiring curb adapters, ductwork modifications, or structural reinforcement may require two to three days. Multi-unit replacement projects for large plazas are staged over several days to minimize disruption to tenants.
Do I need a TSSA-licensed contractor for RTU repair?
Any work involving the gas-fired components of a rooftop unit must be performed by a TSSA-licensed gas technician (G2 or G1 licence) in Ontario. This includes routine maintenance tasks like combustion analysis and igniter replacement. All HVAC Touch technicians who perform gas work hold active TSSA credentials.
What is a curb adapter and do I need one?
A curb adapter is a sheet metal transition piece that bridges the difference in footprint dimensions between your existing roof curb and a new RTU. Most replacements where the new unit brand or model differs from the original will require a curb adapter. We include curb adapter requirements in our replacement quotes and can fabricate custom adapters when needed.
Can you repair my RTU's economizer, or does it need replacement?
In most cases, economizer problems can be repaired rather than requiring full replacement. Common repairs include replacing the actuator motor, sensor, or broken linkage arms. A properly functioning economizer can save 15% to 25% on annual cooling energy costs in the GTA climate, making it one of the highest-return maintenance items on any rooftop unit.
Need Commercial Rooftop HVAC Repair in Toronto?
Contact HVAC Touch for expert RTU repair, replacement, and maintenance across the Greater Toronto Area. TSSA-certified technicians, same-day emergency service, and transparent pricing.