Design Air ClimateCARE 140 Doncaster Ave. Unit 8 Thornhill, ON L3T 1L3 - Phone: (905) 881-1001
Design Air was founded by David Langford in 1969. Mr. Langford graduated from Queen's University in Engineering and also has an MBA degree from York University. Armed with an engineering degree and four years experience in the HVAC and related fields, David Langford formed Design Air with a vision of incorporating engineering skills in his residential and commercial heating and air conditioning practice.

David's brother
Wayne joined the firm while attending Engineering School at the University of Waterloo and partner of the company and currently serves as President of Design Air.

Today, after more than three decades of experience, Design Air is a leading company in design-build projects for both
residential and commercial applications. Commercial projects include restaurants, office buildings, industrial plants, churches, specialty processes, theatres, medical centers, banks and stores. Residential projects include single family and custom homes, town houses, indoor swimming pools, and both high and low rise condominiums.

Design Air has also built a service department that not only provides excellent service on what we install, but the mechanics
also view the house or commercial building as a system which means we can give advice on all aspects of a complete environmental assessment rather than individual components. This provides for a much more thorough approach on what is best for the building.

As a professional engineering company, we are particularly committed to solving your indoor air quality problems, and creating the healthiest, most comfortable environment for you and your family.

To help us achieve this goal, Design Air joined the ClimateCare Cooperative Corporation. This is an Ontario-based organization of like-minded residential service companies which was created to develop group programs such as staff development and training, common practices, marketing, and purchasing. ClimateCare gives us the support we need to continue to deliver the level of service our customers have come to expect from us.

Whenever you purchase equipment from Design Air, you may be sure of the following:

  • An installation that is custom designed for your particular home and its unique indoor environment

  • Work that is always performed in a professional manner by our own hourly paid, engineer trained, fully licensed and helpful service people
  • 24-hour emergency service

  • Friendly, personal service