Surrounding Communities

"We Care"

> Reliable Service. Expert Installers.
> More than 150 years installation experience.

Expert Installation

"We Care"

> Professional Licensed Insured Installers
> No Subcontractors
Message from Unionville Heating and Air Conditioning President: For your safety and the safety of our employees, we are taking all the necessary precautions and closely monitoring the COVIC-19 situation from public health authorities. We are confident in our plans to safeguard the health and safety of our customers and employees.  For more information about COVID-19, please visit Health Canada and Ontario Ministry of Health websites for ongoing updates. Addressing in-home customer service: All services are running on emergency request only. If you have concerns about installations, deliveries, or in-home consultations, we’re here to support you and offer flexibility to reschedule at your convenience. Please contact us if you have questions or want to reschedule any services. Our staff are following social distancing requiring a 2-metre distance from our customers while in their home. We wear disposable gloves and mask and have hand sanitizer on our trucks. Customers need to inform us at time of placing an order if they are if they are sick or have been out of the country.  Have had any visitors to their home who have been sick. Are they in self isolation and for how long.  We are asking customers to wash and or sanitize all door entry handles.  All cheque payments should be put in a sealed envelope and given to the tech. We are following government protocol on social distancing and doing our part daily to flatten the curve as recommended by Health Canada.
Please nominate Unionville Heating and Air Conditioning in the Markham Economist & Sun Readers’ Choice  Awards 2019. We’d be grateful if you would give us your nomination once again this year.  If you were happy with our service, please nominate us.  If there is something more we can do for you, please call the President of Unionville Heating, John St Germain.
Our phone system is working today, 905-479-1290  emergency calls on the weekend if you require service please contact us here, or email us at  Check our facebook page for the latest updates. We will be happy to help you, thank you for your patience and again we apologize for the disruption.
Manufacturers price increase to Canada in January due to new tariffs on copper and steel.  Order now and save up to $400 on your next air conditioning unit and beat the price increase.  Use our layaway plan.  If you are going to replace your air conditioning unit in the spring anyway, order it now and put a small deposit down to secure your savings.  Cost of a new air conditioning unit will increase in the new year, order now and save.   Why wait until spring order it now. Offer expires December 21, 2018.


Residential Heating Solutions

Air Conditioning

Residential Cooling Solutions

Protection Programs

Residential HVAC Maintenance Plans


We have seen many changes over the years; however, the biggest change for us to date has been relocating our Highway #7 offices after three decades. We have a suite in Stouffville, and have created an accessible online presence that provides our customers with 24 hour access to all our services, even in the middle of a cold night or during a hot humid day, we are here for you! To celebrate serving the community for over 34 years we offer our exclusive A/C Spring Tune Up – neighbour or friend promo. “We Care”.
Best Business Readers' Choice award 2018 voted by the people of Markham, Stouffville, Unionville.

Readers Choice Award

Unionville Heating and Air Conditioning wins 18th best business award. Once again, we are the recipient of this coveted “Best Business Award,” voted by you, the people.

We Care

We care about your heating, cooling, recycling, and overall needs. Fill your empty new product box and we’ll take it away for you to your preferred Value Village, goodwill or food bank.

perfect service

Being comfortable with your home air quality and temperature is not just having a system that works, but knowing who to call when something isn’t working correctly. If you’re having an issue with your air conditioner or furnace in Markham, Stouffville, Uxbridge, Unionville, Pickering, Ajax, Whitby, Oshawa, Brooklin or Aurora give us at a call at 905-479-1290 or schedule your appointment online. One of our technicians will soon be on the way.


Consider that some benefits of regular maintenance are immediate while others prevent future problems from developing. Emergency service available.



A wide variety of HVAC products for your home including humidifiers, air cleaners, thermostats and featuring furnaces and A/C by Goodman.



See what our customers say about us. Testimonials on how we build relationships with an understanding of individual need and market knowledge.

Gas Fireplace Service Special


Get your gas fireplace serviced for a discount when servicing your furnace.

Gas Fireplace Repair and Maintenance

Unionville Heating and Air Conditioning is a full-service gas fireplace repair and maintenance company, specializing in quality inspection ,gas fireplace repair, cleaning and certification of gas fireplaces and gas log sets for homeowners, property managers, realtors and home inspectors.

5 great reasons

to choose Unionville Heating

34 Years In Business

Providing home heating and air conditioning solutions to the Unvionville and surrounding area.

15,000 Customers

Customer satisfaction is our number one goal.  Providing excellence in customer care and product knowledge has earned a great reputation for quality and the word travels in our community.

18 Best Business Awards

Thank you for voting Unionville Heating & Air Conditioning, winner of our 18th Markham Economist & Sun Readers’ Choice Best Business Award.

Reliable Expert Installers

Our technicians are highly trained and experts in HVAC service and replacements. We guarantee to do the job right the first time.

Live Telephone Attendants

As a consumer, there is nothing more frustrating than trying to get a live person on the phone when you have home air heating or cooling emergency. Our staff are on the line.

Unionville Heating and
Air Conditioning
company in Stouffville:

home HVAC

Residential home Heating Ventilation and Air Conditioning systems installation, service and maintenance programs.

Duct Work

Ductwork design and installation provide the optimum airflow needed to properly and quietly heat and cool your home.

junk removal

We will not leave any old parts or behind.  We’ll even take the boxes back with stuff you want to get rid of and deliver it to the proper recyclers.

Air Quality

Clean air is essential for good health, and this is especially true when it comes to indoor air in your home.


  • The installers were very courteous and exceptionally neat and tidy.

    Dean & Angie M. Stouffville
  • Very pleased with the work. Installation is neat and tidy, good job!

    Brian B. Stouffville
  • Furnace works beyond expectations. Well done, very neat.

    Mike G Unionville

products serviced


need help?

HVAC Service? Advice is always free. Call:905-479-1290