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Commercial Rooftop Unit Repair, Maintenance & Installation in Toronto & the GTA

Keep your business comfortable and minimize downtime with professional commercial rooftop HVAC service from Green Heating & Air. We diagnose, repair, maintain and replace packaged rooftop units for restaurants, retail stores, offices, warehouses and commercial properties across Toronto and the GTA. Need urgent service? Call our 24/7 commercial HVAC line.

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Commercial Rooftop
Unit Heating & Cooling Specialists

Servicing: Toronto, Mississauga, Brampton, Concord and GTA. certified heating technicians- experts in Rooftop Unit HVAC repairs

Professional Rooftop Unit Repairs

Green Heating and Air services, installs and repairs all makes and models of RTUs including: Trane, Carrier, York, Lennox, Rheem/Ruud, Daikin/Goodman, Bryant and ICP. Our Technicians will access and identify the problem. We’ll source OEM parts to fix your rooftop unit. We’re available for 24/7 emergency repairs – evenings, weekends and holidays. We understand how important it is to keep your tenants and customers, healthy and safe by ensuring your rooftop heating and cooling unit is operating properly.

Rooftop Maintenance

When the temperature drops, rooftop heating unit will have to work harder. With our cold winter climate with snow, rain, hail, ice and wind your rooftop unit may take a beating. Protect your investment with a Maintenance Protection Plan. It’s important to have your rooftop unit (RTU) maintained to keep your operations running efficiently.

  • Regular maintenance visits at least once every 12 weeks (one a quarter) which includes inspections, cleaning and calibrations to for optimal efficiency.
  • Cleaning and filter replacements for optimal air quality.
  • Efficiency Tests

Commercial Rooftop Installation

Green Heating & Air can replace and install a new RTU for your business. These package units come with a: evaporator, compressor, expansion device and air-cooled condenser. We’ll do a complete assessment of your operations. We will look at your floorplan, the roof integrity and consider the size and load your business requires. We’ll do the RTU installation without disrupting your business operations. We’ll install a high-efficiency rooftop system that will lower your energy bills and lower your carbon footprint.

Did You Receive a Red Tag Warning?

A red tag indicates that your rooftop unit is in need of repair or no longer safe to use.
Type A – identified as immediate danger, and your natural gas will be turned off.
Type B – no immediate danger however, there is a short window of time to have the RTU repaired or replaced.

Don’t wait until this happens. Call Green Heating and Air today at 416-627-7724 for your commercial rooftop unit to be inspected. Or you can book an appointment with our web calendar.

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WeatherMaker® 48A Single-Packaged Rooftop Units

High-efficiency scroll compressors with optional digital capability, two-stage cooling for energy optimization across airflow applications and operational flexibility from 120°F to 35°F.

WeatherMaker® 48FC Rooftop 3-27.5 Ton Standard Efficiency Gas Heat/Electric Cooling

EcoBlue™ Technology with a beltless fan system enhances reliability, achieves up to 14.0 SEER and 15.0 IEER for energy savings and ensures clean airflow with an ASHRAE-compliant composite condensate pan.

Weather Master® 48GE Rooftop 3-25 Ton High Efficiency Gas Heat/Electric Cooling

WeatherMaster® 48GE rooftop units combine Puron Advance™ (R-454B) refrigerant, EcoBlue™ fan technology and flexible staged-cooling choices.

48NL – Comfort™ 14 Packaged Gas Furnace/Air Conditioner System

With a 13.4 SEER2 cooling rating and 81% AFUE heating performance, this system provides moderate energy efficiency. Offers year-round comfort with reliable gas heating and electric cooling to help keep temperatures balanced, regardless of the weather outside.

WeatherExpert® Ultra High Efficiency, Variable-Speed Single-Packaged Rooftop Unit with EcoBlue™ Technology

EcoBlue™ Technology with beltless direct-drive fan enhances reliability, variable-speed capacity control optimizes climate adaptability and efficient operation performs in extreme conditions from 0°F to 125°F.

Frequently Asked Questions

What commercial rooftop HVAC services do you provide?
Green Heating & Air provides commercial rooftop unit diagnostics, repairs, preventive maintenance, replacement and installation services. We service rooftop heating and cooling equipment for a variety of commercial properties throughout Toronto and the GTA.
Do you repair commercial rooftop units?
Yes. We diagnose and repair a wide range of commercial RTU problems, including heating failures, cooling problems, airflow issues, ignition faults, electrical problems, blower problems, thermostat and control issues, and other equipment malfunctions.
Do you provide emergency commercial RTU repair?
Yes. If your rooftop HVAC system stops operating and is affecting your business, contact Green Heating & Air for commercial HVAC service. Emergency situations can include loss of heat during cold weather, loss of cooling during extreme temperatures, electrical faults, repeated shutdowns or other problems that prevent the unit from operating normally.
What are the most common commercial rooftop unit problems?
Some common RTU problems include:
Rooftop unit not heating
Rooftop unit not cooling
Weak or reduced airflow
Unit frequently turning on and off
Blower motor or belt problems
Ignition or burner failures
Thermostat and control problems
Electrical faults or tripped breakers
Dirty or damaged coils
Refrigerant-related cooling problems
Compressor or condenser problems
Economizer problems
Unusual noises or vibration
Frozen evaporator coils
Uneven temperatures throughout the building
Unexpected increases in energy consumption
A proper diagnosis is important because several different component failures can create similar symptoms.
Why is my commercial rooftop unit not producing heat?
A rooftop heating unit may stop producing heat because of ignition problems, burner issues, thermostat or control faults, airflow restrictions, electrical problems, safety controls or other mechanical issues. A technician should inspect the system to determine the actual cause before repairs are made.
Why is my commercial RTU blowing cold air when it should be heating?
Cold air during a heating call can be caused by an ignition failure, burner problem, thermostat issue, control fault, airflow problem or a heating component that is not operating correctly. The unit should be inspected rather than repeatedly reset if the problem continues.
Why is my rooftop unit not cooling my commercial space?
Cooling problems can result from dirty coils, electrical faults, compressor issues, refrigerant problems, failed motors, thermostat or control problems, blocked airflow or other mechanical failures. Commercial rooftop units contain several interconnected systems, so an on-site diagnosis is usually required.
Why does my rooftop HVAC unit keep turning on and off?
Frequent cycling can be related to thermostat problems, airflow restrictions, dirty filters, overheating, control issues, electrical problems, equipment sizing or other operating conditions. Repeated short cycling can increase wear on the equipment and should be investigated.
Why is there weak airflow from my commercial HVAC system?
Weak airflow can be caused by dirty filters, damaged or slipping belts, blower motor problems, blocked ductwork, dirty coils or other restrictions within the system. Reduced airflow can affect comfort and may also cause the RTU to operate inefficiently.
What should I do if my rooftop unit is making unusual noises?
Grinding, banging, squealing, rattling or other new noises can indicate loose components, worn bearings, belt problems, motor issues, fan problems or other mechanical damage. If the noise is significant or the equipment appears unsafe, turn the unit off if appropriate and arrange for professional service.
How often should a commercial rooftop unit be maintained?
Commercial RTU maintenance frequency depends on the building, equipment, operating hours, environment and manufacturer recommendations. Many commercial systems benefit from scheduled seasonal or quarterly inspections. High-use locations such as restaurants, retail spaces and continuously occupied buildings may require more frequent attention.
Green Heating & Air can help recommend a maintenance schedule based on the equipment and how it is used.
Why is preventive maintenance important for rooftop HVAC equipment?
Rooftop units operate outdoors year-round and are exposed to heat, cold, snow, rain, ice, wind and temperature changes. Preventive maintenance can help identify worn components, airflow restrictions and operating problems before they develop into larger failures.
Regular service can also help maintain consistent comfort, reduce unexpected downtime and support the useful life of the equipment.