• For Emergency Service Call:   905-428-8080  or  416-697-0822
City Wide Service 24/7


City Wide Service 24/7
We Are Just A Call Away

Air ConditioningRefrigeration
Energy Management

Emergency Service

We provide 24-hour / 365 days
On Call Emergency Repair Service
with a response time of under 2 hours.

Factory Trained MultiStack Service, Trane, Lennox, Carrier, York, York International, Honeywell, En Mar, Engineered Air, Modine, Reznor, Liebert, White Rogers, LG, Cambridge, Temprite, Keeprite, Goodman, Comfort Aire, and more.

Ontario Air Systems is commited to providing the highest standard of service.  We provide complete HVAC/R system repair, replacement and installation as well as preventative maintenance programs for all brands of commercial HVAC/R equipment.  We also provide energy management and indoor air quality services and consultation.


  • Air Driers
  • Boiler Systems (Hot Water & Steam)
  • Humidification Systems
  • Gas Fired Heating Equipment
  • Pumps & Valves
  • Rooftop Units


  • Gas Detection
  • Heat Recovery Ventilation
  • Ventilation Actuators and Dampers
  • Ventilation, Exhaust and Air Makeup Systems
    (Electric, Gas)

Air Conditioning

  • Chemical Treatment of Water
  • Chillers
  • Cooling Towers (Wet & Dry)
  • Multizone VVT & VAV Control Systems
  • Pumps & Valves
  • Rooftop Units
  • Factory Trained MultiStack Service


  • Heat Pumps
  • Pool Heating Systems
  • Refrigerant Containment and Recovery
  • Refrigeration Systems
    (Coolers, Freezers, Walk-in, Reach-in, Special Applications)

Indoor Air Quality / Environmental Systems

  • Air Balancing & Air Quality
  • Computer Room Environmental Equipment
  • Critical Laboratory & Quality Control Systems
  • De-Humidification / Humidification Systems

Energy Management

  • Building Automation Systems
  • Energy Management Solutions

Our Commitment is to Deliver Products and Services of a Consistently High Quality to Enhance the Reputation of All. - Bob Steenson, PRESIDENT