About Us

Who we are

Part of the One Alliance Group of Companies (Limited), One Alliance HVAC serves both residential and commercial clients throughout the Greater Toronto Area. We are fully equipped to install, service, and repair heating and cooling units of all makes and models.

Our carefully trained and experienced technicians lend their expertise to get the job done safely, on time, and with great attention to detail- ensuring client satisfaction while preventing costly, unforeseen repairs. One Alliance HVAC treats your property with great care, as if it were our own.

Our services are covered by $2 million liability insurance. Additionally, our employees are insured under the WSIB (Workplace Safety Insurance Board).

Let us work with you to meet your home or business’ heating and cooling requirements while maximizing energy savings.

To provide our clients with choice and ensure a job well done, One Alliance HVAC is a manufacturer authorized installer for the following HVAC brands: Carrier, Bryant, Keeprite, Mitsubishi and Payne.

Commercial HVAC

In commercial settings, soundness of the HVAC system can make or break your business’ success.

Residential HVAC

Our team of professionals can help you select and install the right heating and cooling systems for your home.


A properly heated building is part and parcel to surviving- and thriving in the harsh Canadian winter.


Whether you prefer air conditioning to be centralized or ductless, One Alliance HVAC has you covered.

Emergency Repair

Count on One Alliance HVAC for emergency repair services on a 24/7 basis.


Ducts are the lifeline between your heater/air conditioner and the rest of your home.

Contact Us Today!

We will get back to you ASAP.

For emergencies, call (416)-828-1300