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Cooling Tower Maintenance™ is part of the D’Arcy Sweeney Limited (DSL) Group of Companies. The DSL Group has been servicing the Canadian HVAC industry, initially as the Trane franchise holder, from 1959-1994 specializing in chilled water and industrial plants in some of the largest facilities in Canada. Cooling Tower Maintenance Inc. was started in 1976 and acquired by the DSL Group in 1988; we specialize in the business of engineering, installing, rebuilding and servicing cooling towers for commercial, institutional, industrial, manufacturing and residential markets in Canada. Over the years, we expanded into Humidification and portable air conditioning rentals. Today, Cooling Tower Maintenance Inc. operates nationally through its offices in Mississauga and Calgary.

Please select a line of business to learn more.

Cooling Towers

Industrial and Commercial Towers, Remanufactured or replaced.


Canada’s Distributor of Humidifirst and Pure Humidifiers.

Air Conditioning

Air Cooled & Water Cooled Portable Air Conditioning By CTM.

Our Friends at GTT OnSET

GTT Onset is a full-service non-destructive testing company.


Cooling Tower Sales and Service coast to coast. Check out our work in Ontario and Western Canada.

“Been dealing with CTM for years.

Absolutely the best in both the field service and the office staff.”

Peter Niggemeyer, Colliers International

“I just want to thank you for the after-sale service that you and your company has provided.

Looking forward to a good season.”

Murari Patodia, Patodia Eye Institute

“I am impressed with their level of service and expertise. They deliver quality work the first time.

They are certainly reliable dependable and always excellent pricing.”

Bill Herridge, College of Physicians and Surgeons of Ontario


Here are just a few of our trusted partners.