About Us

Your Residential & Commercial HVAC Specialists!

Cullen Heating & Air Conditioning has been providing quality service for homes and businesses since 1970.

As your Durham Region heating and air conditioning specialists, we offer a number of HVAC services to keep you and your family comfortable year-round. Whether it be heating, cooling, or taking care of the air you breathe – we can do it all!

We Specialize In:

HVAC Systems

  • Furnaces
  • Air Conditioners
  • Ductwork Conversions
  • Humidifiers
  • Rentals
  • Air Cleaners
  • Hot Water Tanks
  • Programmable Thermostats
  • Fireplaces
  • And More!

Award-Winning Service

For many years, our customers have nominated and voted for us as their favourite Heating & Air Conditioning company in the Oshawa/Whitby Reader’s Choice Awards.

We’re also listed with the Better Business Bureau. We have maintained an A+ rating and have been accredited since September 2010.


Don’t let cost prevent you from having a more comfortable home! Financing is available to qualified customers through Vista Credit. Contact us for details.