On Demand Experience

Clow Darling Limited’s plumbing service department offers a full range of commercial and residential services. With over 100 years of combined experience, our Thunder Bay operation is able to meet all of your construction, maintenance, and service needs. We offer 24 hour emergency service, fully equipped service vehicles, and take pride in our speed of service and quality work.

Commercial Services


We offer a full range of commercial and residential services. maintenance, and service needs. This includes fully equipped service vehicles, and take pride in our speed of service and quality work.

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Clow Darling offers the three central functions of heating, ventilating, and air-conditioning. HVAC systems can provide ventilation, reduce air infiltration, and maintain pressure relationships between building spaces. How air is delivered to, and removed from spaces is known as room air distribution.

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Clow Darling provides service on existing boilers and systems and the replacement and installation on complete systems and system components, for the residential to light industrial, institutional, and commercial sectors.


We offer sales service and installation of all types of air conditioning units. Our experts can select a wide range of reliable, high performance cooling/heating products featuring excellent quality at competitive prices and our qualified on-site technician will help you determine the best course of action.

Radiant in Floor Heating

Our technicians are factory-trained with Rehau and Wirsbo piping systems. Whether it is radiant floor heat or domestic water systems, Clow Darling can ensure a quality job complete with warranty.

Over 75 Years Servicing our Clients

Clow Darling is the largest complete mechanical service contractor in Northwestern Ontario specializing in plumbing, heating, cooling, boilers and piping for the industrial, commercial, and residential markets. Our services also include a mobile air conditioning and heating department.

We pride ourselves on:

  • 24 hour emergency service

  • Over 50 expert technicians and tradesmen

  • Providing customers with quality workmanship and products, reliability, and efficient services for over 75 years

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For over 7 decades Clow Darling has earned the confidence of our largest and smallest clients by being consistent.

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