Dunn Heating and Air Conditioning is based at 75 Rankin St in Waterloo, Ontario, and provides heating, cooling and plumbing services across Waterloo Region. The official website identifies the business as operating since 1973 and lists Waterloo as its headquarters, with service extending to nearby communities including Kitchener and Cambridge. BBB’s location-specific profile also identifies the Waterloo address, reports that the company is BBB Accredited with an A+ rating, and lists a Technical Standards and Safety Authority licence number in its records.

For HVAC projects, the company documents furnace, air-conditioner, boiler and heat-pump installation and repair, as well as humidifiers, UV air purifiers and air-duct installation. These offerings make it relevant for homeowners arranging routine maintenance, diagnosing a heating or cooling breakdown, or considering equipment replacement. Its official materials state that it works on all brands and offers same-day service where available; consumers should confirm timing, scope and equipment options for their specific system.

Dunn also has a documented plumbing offering. Its Waterloo plumbing pages list leak and pipe repair, drain and sewer work, hydro jetting, water-heater service, fixtures, sump pumps, water filtration, water softeners and Kitec plumbing replacement. The company says it serves residential and commercial plumbing customers, while its broader website presentation is principally focused on household heating, cooling and plumbing needs.

The official website and BBB profile list 24-hour availability. Because emergency availability can differ from scheduled appointment timing, consumers should ask whether their request is handled as emergency dispatch, same-day service or a booked visit, and request a written scope and price before authorizing non-emergency work.

FiveBest summary: A long-established Waterloo provider combining documented HVAC and plumbing services with stated 24/7 availability.