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Dunn Heating and Air Conditioning

HVAC Companies in Waterloo, Ontario

Ranked #5 in Waterloo | Grade B-

Dunn Heating and Air Conditioning

Local HVAC contractor providing heating, cooling, and water heating services in Waterloo, Ontario. Recent jobs include full furnace and AC changeouts, heat pump installations, and tank-to-tankless conversions.

Why Homeowners Choose This Business

Local presence in Waterloo, Ontario with 24/7 availability. Reviews note helpful communication, punctual arrivals, and clean job sites. They handle full system changeouts and can remove old equipment as part of the install.


Service Area

Serving Waterloo, Ontario and nearby communities across the Waterloo Region; call to confirm service to your location.

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How This Business Compares

A quick local comparison based on review strength, business detail, and local service fit.

  • Has more review volume than many local competitors.
  • Shows strong customer satisfaction signals based on review quality and volume.

Trust Signals

24/7 availability listed; call for current response times.

Services Covered

Plumbing Services Renovation Services Supplier Furnace Installation Repairs Air Conditioner Installation Heat Pump Installation HVAC replacement Thermostat setup Tankless Water Heater Water Heater Replacement Hvac Maintenance ducted HVAC Home Heating Cooling Service Hvac Repair

Heating and cooling installation and replacement, furnace and AC service, heat pump options, thermostat setup, and tank/tankless water heater installation and removal of old equipment.

Reviews

Customer Reviews

Alison Dearlove

I was really excited to purchase a new heat pump and furnace and humidifier from Dunn Electrical. The day of install went well. The team arrived and worked hard until 8pm. They were kind and clean. My thermostat however was not connecting t…
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I was really excited to purchase a new heat pump and furnace and humidifier from Dunn Electrical. The day of install went well. The team arrived and worked hard until 8pm. They were kind and clean. My thermostat however was not connecting to the heat pump properly. I was told they would have to come back another day to connect it. Kind of annoying as I would need to be off work and available for them to attend my house again but these things happen. 3 days later they came back and installed a new thermostat. Everything seemed to be working properly so they left. Again they were very pleasant to deal with. Within an hour I noticed the heat wasn’t working. Only the fan was running. I tried some adjustments but nothing worked. Around 1pm I called Dunn and explained the situation. They told me that they could come the next day. I said no way. I had a working furnace until they came and now I had no heat and it was 11 degrees in my house. I’m a single mom with a child and pets and the need to have someone comeback and fix what they messed up. At 8pm someone came. He was able to fix the furnace so it was running again. The told me someone would have to come back the next day to fix something. I had to arrange someone to be at my home the next day for a technician to come again. That evening I received a call yah a technician would have to come to move a safety switch. Well now I was annoyed. I work Monday to Friday and was annoyed about a 5th service call. I set up the appointment for a week away when I could have someone at my house for me. 2 days later I luckily went to my basement and found water leaking near my water heater. Upon inspection I saw that it was coming from the tubing for my newly installed humidifier. I called Dunn yet again and they set up an appointment for the next day which I again had to arrange someone to be at my house for. I was able to put a bucket under the leak otherwise there would have been a huge amount of water. They came the next day to fix that leak. Again. The technician was very nice and helpful. Today they came to fix the switch I was told needed to be moved. The technician came and had no idea what needed to be done. The person from Dunn who called and told me this switch needed to be done had told me they would have all the information in the service ticket. Not the case since the technician that came didn’t know what was supposed to be done. So another day I had to arrange for someone to be at my house wasted. Also several days after the removal and install process a ton of screws and drill bits were found in my driveway where the Dunn truck had been parked. Fortunately I didn’t get any in my tire! Overall a very unpleasant experience with this company. I gave two stars only because everyone I have spoke to have been kind, and pleasant to deal with. There are so many HVAC companies. Find another one

Dylan Groves

From top to bottom, the folks at Dunn did a magnificent job outfitting me with a new furnace. Henrik was able to revive my old one long enough to keep me from freezing (important!); Josh explained my options very clearly, giving me great ad…
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From top to bottom, the folks at Dunn did a magnificent job outfitting me with a new furnace. Henrik was able to revive my old one long enough to keep me from freezing (important!); Josh explained my options very clearly, giving me great advice about the best long-term solution for my home, and answering my questions with friendly enthusiasm; Tanner and Alai were willing to come to my place early on a Saturday, and thanks to their hard work the new furnace was up and running in less than 3 hours. The whole team was excellent--professional, courteous, skilled--and the price was very competitive. Dunn's the one!

Myles MacInnes

Converted from a tank water heater to a tankless model. Dunn was easy to work with and the install went really well. The old tank was taken away and work site was neat and tidy. Thanks to Tanner and Alai for their work, and thanks to Darren…
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Converted from a tank water heater to a tankless model. Dunn was easy to work with and the install went really well. The old tank was taken away and work site was neat and tidy. Thanks to Tanner and Alai for their work, and thanks to Darren for his quick response to my request for a quote. Dunn has an excellent team.

Rob Smyth

Thanks Sean for being early, professional and helpful in resolving our infractions. We have been using Dunn Heating for many years for our heating and cooling needs. When our furnace died in Nov.24, Dunn came and restored our heating very q…
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Thanks Sean for being early, professional and helpful in resolving our infractions. We have been using Dunn Heating for many years for our heating and cooling needs. When our furnace died in Nov.24, Dunn came and restored our heating very quickly. Unfortunately the finished project including the venting tubes left us with a great amount of disappointment. You can see in the photo how they make the front of our house look. It is not a great resale look.

Karl Williams

I’m very happy with the new furnace and central air conditioner! The crew from Dunn showed up on time and did a great job installing the new system. The guys worked hard all day and stayed a bit later to get it finished. Super nice people a…
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I’m very happy with the new furnace and central air conditioner! The crew from Dunn showed up on time and did a great job installing the new system. The guys worked hard all day and stayed a bit later to get it finished. Super nice people and great to deal with. They took all the old equipment away and cleaned up after they were done. Thanks!

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Emergency Service

Emergency service may be available for urgent issues.

Frequently Asked Questions

What HVAC systems do they install?

Customers mention installations of furnaces, central air conditioners, heat pumps, and tankless water heaters. They also handle removing old equipment and setting up new thermostats when part of the project.

Are they available after hours?

Their posted hours indicate 24/7 availability. For urgent issues, calling ahead is recommended to confirm response times.

Do they provide quotes before starting work?

Reviews reference quotes and clear explanations of options before installation. Ask for a written quote that outlines equipment, timelines, and any needed follow-up visits.

Will they remove my old furnace or water heater?

Multiple reviewers note that the crew hauled away old equipment as part of the job. Confirm disposal details and any related fees when scheduling.

What if my thermostat or venting needs adjustments after install?

A few reviews mention return visits to complete thermostat connections or refine exterior venting. Discuss expected follow-ups during the estimate so you know the plan and timing.