Dunn Heating and Air Conditioning
Dunn Heating and Air Conditioning provides HVAC and plumbing services from its Waterloo base. It has provided HVAC services throughout Waterloo Region since 1973 and offers 24/7 emergency HVAC service.
Business Highlights
- Its technicians are licensed and trained to service major HVAC systems.
- Its technicians complete training, certifications and background checks.
- It is an authorized Lennox® dealer.
- It lists TSSA licence FS R0038598001.
Service Area
Baden, Elora, Fergus, Guelph, Waterloo, Cambridge, Conestogo, Kitchener, Elmira, St. Jacobs, Linwood, New Hamburg, Heidelberg, Rosendale, Wallenstein, Bloomingdale, St. Clements, Winterbourne and West Montrose.
Taking calls through ProsGrade. Dunn Heating and Air Conditioning is one of 6 HVAC companies ProsGrade lists in Waterloo, Ontario.
11 services listed, including Furnace installation, Furnace repair and Boiler services. Open 24 hours, 7 days a week. Rated 4.8 from 1,000 reviews.
- Verified listing details
- Service information
- Customer review signals
- Photo gallery
- Public contact information
- Published local profile
How This Business Compares
How Dunn Heating and Air Conditioning compares with the other 5 HVAC companies on ProsGrade in Waterloo, using public Google ratings and review counts.
- Has the most Google reviews (1,000) of the 6 Waterloo HVAC companies on ProsGrade.
- One of 5 Waterloo HVAC companies on ProsGrade rated 4.7 or higher from at least 10 reviews.
Trust Signals
24/7 availability listed; call for current response times.
Services Covered
11 services- Furnace installationPrecise sizing and configuration of high-efficiency furnaces
- Furnace repairAll makes and models; 24/7 urgent repairs
- Boiler servicesSteam and hot-water systems; installation, servicing and emergency repair
- Heat pump servicesYear-round installation and servicing for heating and cooling
- AC installationSizing, placement and installation
- AC inspectionInspections for potential issues before system failures
- AC repairAll models; emergency repairs
- UV air purifiersInstallation and care for HVAC-integrated systems
- HumidifiersWhole-home setup and maintenance
- Water heater installationOld-unit removal and setup of energy-efficient replacements
- Water heater repairAll types and brands
Reviews
What customers say
Customers praise the crews' professional, courteous manner, and installation accounts mention old equipment removal and tidy cleanup. One customer reports that the heat stopped within an hour of a replacement thermostat; a technician restored the furnace that evening, but the customer was then told another visit was needed to move a safety switch, which they described as a fifth service call. Another customer says Dunn restored heating quickly after a furnace failure but was disappointed by how the finished venting looked at the front of the house.
Customer Reviews
Dylan Groves
Myles MacInnes
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Frequently Asked Questions
How quickly does Dunn Heating and Air Conditioning handle repairs and installations?
It offers same-day repairs and next-day installations.
What does Dunn Heating and Air Conditioning check when diagnosing an HVAC problem?
Its diagnostics check for refrigerant leaks, thermostat issues, airflow restrictions and electrical problems. The company says it explains the findings and provides upfront pricing; financing and payment plans are available.








