Please vote for Unionville Heating and Air Conditioning in the Markham Economist & Sun Readers’ Choice  Awards 2020 and the Stouffville Sun-Tribune Readers’ Choice Awards 2020. We’d be grateful if you would give us your vote once again this year.  We’ve been nominated in three categories. If you were happy with our service, please vote for us in Markham and surrounding area or vote for us in Stouffville.  If there is something more we can do for you, please call the President of Unionville Heating, John St Germain.

Our phone system is not working working today. Please call John’s cell number for emergency service, 416-990-1535  . If you require service please contact us via John’s cell phone, 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.

help flatten the curve - practice physical distancing - Unionville Heating and Air Conditioning Inc

Furnace Service Overdue?

Furnace service after this long hot summer is not a good idea, it is a GREAT IDEA!

Stay ahead of the curve of a “no heat” mid-winter breakdown and have your system checked before winter. We are experiencing more calls at this time than ever before from our customers ordering their fall service. When you A/C is working all summer, your furnace works even harder to keep up with cooling your home. Don’t be last in line for service when the first cold snap hits us.

If your furnace is overdue for service (every two years) now is the time to order by phone or online. Hurry the winter is fast approaching.

  • Consider having your furnace serviced after this long hot summer.
  • Your furnace motor was working all summer long whenever the A/C turned on.
  • It was a hot summer.  Your furnace had a lot of use and may be overdue for service.

Safe Service Call

  • We only go into your house upon request.
  • Staff have safety training.
  • We use personal protective equipment.
  • Our Technicians will service your HVAC system, clean and run tests.
  • We’ll send you a report by email.

Make an appointment here or call our service department at 905-479-1290.

Order Furnace Service Now

please fill in this form


    Verification - enter the code from below.


    Furnace Backup Power During Electricity Outage

    Get backup power to your furnace during a power outage. All you need is CarGenerator™ and an extension cord.  When the power goes out due to high winds, heavy rain or ice, just plug in CarGenerator. You already own 75% of a backup generator, sitting right there in your driveway! Add CarGenerator to your vehicle, […]

    clean gas fireplace log set Unionville Heating and Air Conditioning
    dirty gas fireplace log set Unionville Heating and Air Conditioning

    Gas Fireplace Repair and Maintenance

    Get your gas fireplace serviced with your furnace.

    Satisfied Customers doing business with Unionville Heating and Air Contioning

    Surrounding Communities

    "We Care"

    > Reliable Service. Expert Installers.
    > More than 150 years installation experience.
    Goodman logo at Unionville Heating and Air Conditioning
    Air Conditioning Installation Outdoor Unit

    Expert Installation

    "We Care"

    > Professional Licensed Insured Installers
    > No Subcontractors
    Goodman logo at Unionville Heating and Air Conditioning
    cleaning outdoor air conditioner unit Unionville Heating and air conditioning
    Dirty outdoor air conditioning coils cleaning by Unionville Heating

    Service Makes Sense

    We will perform the spring preventative maintenance on your AC unit.

    You can use your service invoice later on as a deposit towards a new system, for up to 24 months later. (maximum $500)

    Message from Unionville Heating and Air Conditioning President:

    At Unionville Heating and Air Conditioning, the safety and well-being of both our Customers and our Service Technicians is always our top priority. Rest assured that we are actively monitoring the COVID-19 situation and are taking precautionary measures to aid in keeping our communities safe. As an essential service to our customers, we are committed to implementing best practices to help prevent the spread of disease and ensure we can continue to provide a high level of service.

    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.

    To help with prevention, we are taking the following precautionary measures to protect our Customers

    Addressing in-home customer service:

    How we can all keep safe

    Service Technicians will be keeping recommended safe social distance and will not be shaking hands with customers, as suggested by the Public Health Agency of Canada.  Our Service Technicians have been equipped with an ample supply of:

    • hand sanitizers
    • disinfectant wipes
    • masks
    • single-use gloves
    • boot covers

    Any Service Technician who has flu like symptoms will be asked to contact the Public Health Agency and follow the COVID-19 testing protocol, including self-isolation where required.

    Precaution questions

    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. Please be prepared to answer brief health and safety questions related to COVID-19 with our Unionville Heating and Air Conditioning Service Technicians

    Instructions for a service visit

    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.

    Business Update

    Unionville Heating and Air Conditioning

    October 22, 2020

    • We are experiencing a high volume of new furnace sales.  Put a small deposit down now to get spring installation.  By pre-ordering you get priority.  Most manufacturers fill back-orders before new orders.
    • We are open for business.
    • We are ready to work during COVID-19.
    • Our staff is equipped with PPE.
    • All phone calls and messages will be answered during regular business hours. You can also make a service call on the appointment form here.
    • All request for service can be booked by phone or by email or by contact form on our website.
    • We will respond within one business day to answer any questions.
    Please nominate Unionville Heating and Air Conditioning in the Markham Economist & Sun Readers’ Choice  Awards 2020. 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.
    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.  As a result, 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 35 years we offer our exclusive A/C Spring Tune Up – neighbour or friend promo. “We Care”.
    Readers Choice awarded to Unionville Heating in the heating and air conditioning category for 2019

    Readers Choice Award

    Unionville Heating and Air Conditioning wins 19th best business award. Once again, we are the recipient of this coveted “Best Business Award,” voted by you, the people.
    Big We Care Heart of Unionville Heating and Air Conditioning

    We Care

    For the reason that we care about your heating, cooling, recycling, and overall needs. You are encouraged to 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. Therefore, 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.

    clean gas fireplace log set Unionville Heating and Air Conditioning
    dirty gas fireplace log set Unionville Heating and Air Conditioning

    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

    35 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.  Most importantly, providing excellence in customer care and product knowledge has earned our great reputation for quality.  As a result, the word travels in our community.

    19 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. Therefore 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 a home air heating or cooling emergency. For that reason, 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.

    Green Recycling

    You will not have any old parts to clean up.  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



    Not readable? Change text. captcha txt