Providing fast, reliable, quality service ensuring your comfort and satisfaction.

Enjoy improved home comfort with high-efficiency heating and cooling systems while saving energy and money. Clow Darling offers filtration systems, humidifiers and other systems for keeping the air healthy and clean in your home.

Clow Darling Limited located in Thunder Bay Ontario has the right home environment products to ensure your comfort. Let our highly trained installation and service group ensure your heating and cooling systems are installed and working to manufacturer specifications.

Residential Services


Air Conditioning

We provide complete Sales, installation, maintenance and repair of all models and makes of Air Conditioning Systems. Our qualified on-site technician will work with you to select from a wide range of reliable, high performance products featuring excellent quality and competitive price and our on-site technician will help you determine the best course of action.

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Heating and Boilers

Our experts can help you select from a wide range of reliable, high performance products and our qualified on-site technician can help you determine the best course of action.

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Ductwork Cleaning

All duct cleaning work is done using our HEPA-AIRE Power Vac. This system is portable, which enables our technicians to reach and thoroughly clean entire duct systems.

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Plumbing Services

Clow Darling Limited’s plumbing service department offers a full range of residential services. With over 100 years of combined experience, our staff 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.

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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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