About Unionville Heating


nionville Heating was established in 1985 and is a privately owned and operated company.

Professional Service

We serve the residential market only, and exclusively to the Markham, Unionville and Stouffville areas, for over 35 years.  Our experience has enabled our technicians to focus in on every detail when installing or servicing the system in your home.  As a result, we have created a standard of excellence second to none.  The company’s reputation is supported by a referral list of customers happy to do business with a local business.

Most consumers prefer doing business with a company they can trust. One that offers stability and a proven track record of providing quality products and exceptional service. They know the benefits of experience and knowledge they want it done right the first time!

Unionville Heating is also the proud recipient of the Readers Choice Award for Best Business for 19 years.

Unionville Heating Best Business Award 19yrs

Charitable Support

Care and Share, Value Village and Habitat for Humanity, Markham Stouffville Hospital, Markham Shriners.

Big We Care Heart of Unionville Heating and Air Conditioning

Unionville Heating & Air Conditioning IconUnionville Heating & Air Conditioning

18 Ringwood Drive, Whitchurch-Stouffville

4.9 127 reviews

  • Avatar Jack Neiman ★★★★★ a year ago
    I called Unionville Heating to have our air conditioner repaired (it just stopped working). I mentioned to the person who took my call that my mother was 83, and if it was possible to have someone come out today to take a look because … More I didn’t want her in a home without air conditioning.I was advised that “Dillion” would be out to our home between 2pm - 4pm.At 1:57 the truck pulled up, and within 30 minutes Dillion assessed and fixed the issue.He advised that more then likely we would need a new unit and then gave me details on what that entailed.Dillion was such a well informed, professional technician that I will most likely be purchasing my unit from Unionville Heating.I received wonderful service from your company and would happily recommend them to any of my neighbors.

Customer Satisfaction

We value your feedback.  After service or installation, each of our customers is asked to provide feedback after service or installation of a furnace or air conditioning unit.  Here are the results.

Overall, how satisfied or dissatisfied are you with our company?

Very Satisfied 98.5%
Customer Satisfaction

Meet Our Staff

All our service staff are all licensed, bonded and insured.  Every member of the team carries valid ID.

  • Nick Russo
    Nick Russo Installation and Service Technician
  • Alex Guzman
  • Dillon LeBlanc
    Dillon LeBlanc Installation and Service Technician

    Call: 905-479-1290

  • Chantalle St Germain
    Chantalle St Germain Office Administrator

    Call: 905-479-1290

  • John St Germain
    John St Germain President

    Call or Text: 416-990-1535

  • Lisa St Germain
    Lisa St Germain Public Relations

    Call: 905-479-1290

  • Todd Nesbitt
    Todd Nesbitt Installation and Service Technician

    Call: 905-479-1290

  • Michele Adams
    Michele Adams Office Administrator

    Call: 905-479-1290

  • Dave Mainland
    Dave Mainland Chief Operations Manager

    Call: 905-479-1290

  • Eric Ranchigoda
    Eric Ranchigoda Service Manager - Markham Pickering Unionville

    Call: 905-479-1290


  • Avatar Laurie Daniels ★★★★★ 2 weeks ago
    Absolutely great company from start to finish! They answered the phone promptly and dispatched an installer within an hour of reporting no heat. They diagnosed the issue immediately and had my new furnace installed quickly and efficiently. … More The installer, Nick even dropped off two heaters that night to get us through until the installation could be completed. I'm thoroughly impressed with how quickly they respond and take action! Thanks so much for a seamless installation at a time I'm sure is extremely busy with the holidays approaching. You have a new customer and I wouldn't hesitate to recommend Unionville Heating & Air Conditioning! Your customer service is second to none!
  • Avatar Peugeot Citroen ★★★★★ a week ago
    Called Unionville Heating & Air Conditioning as the furnace wasn't firing up (again) and after two service visits by another independent HVAC person, I wanted a second opinion. John, the owner, personally returned my call (on Boxing … More day!). Rather than just send out a service person, he had me walk him through the situation and the issues I was having. His recommendation? To get the previous HVAC repair person to honour their previous service visits and fix the furnace issue but if they weren't able to, he would gladly send someone immediately. Fortunately, it was a simple issue and fixed by other service person. John even followed up later in the afternoon to ensure all was well. It's no wonder this business is highly regarded -- true professionals who are honest. Thank you John and I highly recommend this company!
  • Avatar Vita Sottile ★★★★★ 5 months ago
    Very impressive business. Exceptional work and customer service. Can't say enough about the staff from the technician Todd who diagnosed the problem with the old A/C unit to the installers who promptly came to install the new unit. … More Everyone who came into my home was prompt, courteous and followed proper Covid 19 procedures. The owner even called to make sure I was satisfied with the work performed after the job was completed. I highly recommend this company for all your AC and Heating requirements. Thank you again to the entire staff that was able to get my new AC installed and working efficiently...greatly appreciated!!
  • Avatar Graham O'Neill ★★★★★ a month ago
    We have used Unionville Heating for many years and always found them to be very professional and excellent at there profession. Today Nick Russo was the technician and he was punctual, polite and very proficient at his job. I would definitely … More recommend Unionville heating to anyone needing there services.
  • Avatar Patricia Wong ★★★★★ 4 weeks ago
    fireplace maintenance, very easy to book and very good with communication. Professional service provided. 100% would recommend.
  • Avatar Trevor Manning ★★★★★ 9 months ago
    What can I say about Unionville Heating & Air Conditioning, from start to finish, all services were taken care of with the utmost professionalism, and attention to detail.
    I'm a contractor myself so I feel I know what to expect
    … More as far as new installation of equipment entails. And they have definitely delivered. We had our furnace, and A/C removed and replaced with new, efficient equipment.
    The install was super clean and professional, and technicians Dave, Ryan, and Liam were very efficient, friendly, and did a great job. Service tech Todd took his time to see what could be done with our old A/C in the meantime until our install date came a few days later.
    Owner, John was very responsive, and happy to help, and take time to answer any questions I had regarding the process. Even Michele in the office took her time to answer questions and was a pleasure to speak with over the phone.
    Special shout out to Dave, thanks for taking the time. Highly recommended HVAC company.
  • Avatar Lynda Porter ★★★★★ 5 months ago
    I have used Unionville Heating for a number of years, and will continue to do so, for the maintenance of my furnace, a/c and gas fire, and I have always received excellent service. Erik has once again serviced my ageing gas fireplace with … More excellent workmanship and attention. He is extremely thorough and knowledgeable and offers trustworthy advice. He is always very pleasant and has made sure all Covid protocols were followed.
  • Avatar Marc Renzella ★★★★★ 4 months ago
    After 19 years, it was time to replace the builder installed furnace and the air conditioner that Unionville Heating & Air Conditioning (UHAC) installed when we first moved into our new house. After researching and soliciting input … More and quotes from two other reputable companies, UHAC was a clear stand-out. They provided a competitive quote for quality products and the installation went flawlessly on the date scheduled. The installation team was very professional and respectful during these challenging Covid days. They are a fantastic company and highly recommend them. We couldn't be happier.
  • Avatar Derek Ng ★★★★★ 7 months ago
    This is the second time I have called Unionville and both times the experience has been fantastic. I always confident that I am getting the best service and the best advise. Honestly, having an HVAC breakdown can leave you feeling vulnerable...these … More guys put you at ease and aren't looking to take advantage. Highly recommend.
  • Avatar Andrew Nicol ★★★★★ 10 months ago
    Excellent customer service! I recently purchased a new air conditioner from Unionville Heating and Air Conditioning, which will be installed next week. In the meantime, our current air conditioner (which was NOT purchased from Unionville … More Heating and Air Conditioning) has failed 3 times. After our purchase, they said they would keep our current system running at no charge, which they have. Each time I’ve called for service, they have responded quickly and the service technicians are all friendly, highly skilled and knowledgeable in their field. Every person I’ve dealt with has been professional and beyond helpful. From John (the owner), to the office staff, to their technicians. In the past, I have called Unionville Heating and Air Conditioning for furnace and fireplace (2 fireplaces) maintenance, and was very impressed and pleased with this service as well. I highly recommend this company for any of your heating and cooling needs!
  • Avatar RobinWayne Daniels ★★★★★ 6 months ago
    Excellent service! Feel confident with knowledge and work completed.
    Very professional and open to answering any questions or concerns.
  • Avatar Janet Read ★★★★★ 6 months ago
    Great job. On time a
  • Avatar sean stone ★★★★★ 7 months ago
    Originally brought them in for a repair based on great reviews. The unit needed a $500 repair, but since it was a 30+ year old unit, they offered to apply the repair costs to the cost of a new unit. I took them up on it. They were great … More with communication, and, in these COVIDy times were very safe and clean. Highly recommend.
  • Avatar Don Berard ★★★★★ 7 months ago
    Todd gave us great service! On time, very informative, polite & concerned with our enquires.
  • Avatar Alan G ★★★★★ 8 months ago
    Very Professional AC and Heating system installation, everything went very well and they even fixed my Nest thermostat by adding the 5th wire so it no longer runs out of batteries! I will be recommending them to family and friends for sure. … More
    Keep up the great work!


HVAC Service? Call:905-479-1290



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