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Discover Our Story

Clement Marchand Natural Gas Services Ltd. Heating & Air Conditioning.


Clement Marchand, founder of Clement Marchand Natural Gas Services Ltd. Heating and Air Conditioning has built his company's reputation on a solid foundation of providing high-quality HVAC products and personalized service to residential and commercial customers in Ottawa and surrounding areas.


We supply and install energy-efficient natural gas products. Excellent warranties back these products. Service is provided by licensed and knowledgeable technicians who regularly attend refresher courses.

Our Family Is at Your Service.

Proud of his 40 years of business success, Clément Marchand, founder, is passing the torch to his children Chantal and Patrice.


Well-trained and experienced, they will ensure continuity in delivering high-quality products and personalized services.

Since 1971, the Marchand family has been 100% dedicated to making your life more comfortable year-round, whether it's heating, cooling, air quality or the environment.

Our trucks have proudly paraded the streets of the Ottawa region 24 hours a day since 1971 and are easy to spot thanks to their blue and white design. We are experts in service and installation and cater to residential and commercial sectors.


Founded by Mr. Clément Marchand, with the support of his wife, Ms. Pierrette Marchand, the family business is now run by the couple’s children:

Pat Marchand

Director, Sales and Marketing / Road Operation Manager

Chantal Marchand

Director of Administration and Finance

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Dedicated to Providing Excellent Service

Meet Our Team

Meet Our Team

Photo of Pat Marchand

Pat Marchand

Director, Sales and Marketing / Road Operation Manager 


Pat Marchand is the Director of Sales and Marketing at Clément Marchand. Involved in the family business since his teens, he is well practiced in every step of the sales process, from the very first contact with the customer, right through the installation process and post-sales follow-up. He is equally qualified in residential and commercial installation, and also specializes in hydronic heating (boilers, radiant floor heating and hot water heater systems). His motto: Listen to your customers and offer great products, tailored to their specific needs.



  • Certified - heat loss in homes

  • Certified - mechanical design

Photo of Chantal Marchand

Chantal Marchand

Director of Administration and Finance 


Chantal Marchand is Director of Administration and Finance at Clément Marchand. Holding a Bachelor’s degree, she manages the company’s finances while making sure everything runs smoothly on the administrative level.

Photo of Richard Lemelin

Richard Lemelin

Service Department Supervisor 


With over 17 years experience in air conditioning and heating, Mr. Richard Lemelin oversees the smooth functioning of the service department, for both residential and commercial contracts.



  • Gas technician G1, TAG 1, TAG 2

  • Oil technician OBT-2

  • CCM

  • Refrigeration and air conditioning mechanic 313A

  • Backflow tester OWWA

  • Certified ODP

Photo of Michael Borthwick

Michael Borthwick

Installation Supervisor Residential and Commercial


I am pleased to introduce myself as the Installation manager for Clement Marchand Natural Gas Service Ltd. I bring a vast amount of construction and installation experience as a G1 fitter, Ventilation design certified and a Red Seal refrigeration mechanic for the past 25 plus years, with a constant vigil on customer service.

Photo of Johanne Taillefer

Johanne Taillefer




With over 30 years experience at Clément Marchand, Johanne is the number one dispatcher in the HVAC industry. It will be Johanne’s pleasure to answer your call or book your service appointment.

Photo of Jeff Asselin

Jeff Asselin

Sales Representative (Residential) 


Jeff Asselin will meet your heating and air conditioning needs in the residential sector.

residential sector.

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Spoken Languages

  • English

  • French

Payment Methods

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Payment by email

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