Welcome to Core One


Core One Mechanical Group Inc. is your single-source HVAC solution. A leader in commercial industrial ventilation, heating and air conditioning Core One Mechanical has the experience to quickly solve your commercial heating and cooling systems design, installation, maintenance, and equipment repair problems.

With an unmatched commitment to providing superior service, businesses like yours all across the Toronto area have come to trust Core One Mechanical for fast response times, affordable prices and reliable performance. It’s what our customers expect and it’s what we deliver. We understand that down time is expensive. We are driven to keeping you up and running as smoothly and seamlessly as possible. That’s why we offer an exceptional 2-hour emergency response time on mission critical equipment and warranty for repairs on your equipment. And that’s just the beginning. We create comprehensive solutions for our clients designed to avoid a crisis before it begins. Partnering with you to develop a plan to reduce costly emergency service calls and your overall HVAC operating costs. That’s why we are trusted by leading manufacturers and business’s all over Ontario.


Incredible Processing Power Combined With an Ultimate Commitment.


Core One has been in business for over 20 years and during that time has taken care of numerous commercial air conditioning and heating needs of all kinds of commercial and industrial businesses and government buildings.


Reliable Commercial HVAC Service provided anytime, anywhere emergency repair service to our valued clients. That means no matter when the system needs repair, a Core One Mechanical Group Certified technician will fix it right away..


A building is more than the sum of its parts. By looking at the entire building as a complete system, Core One Mechanical Group Inc. can identify the most cost effective and efficient path to a greener, more efficient and healthier environment.

What Our Clients Say…
  • I would like to express my highest appreciation to Core One Mechanical Group Inc. on their timely and precise responses to a partial cooling deficiency that occurred on the night of April 18th, 2016 at our location. Cory Snider did a thorough evaluation and restoration of the defunct cooling circuit of AHU-10, noting he was able to secure tools and materials at the middle of the night, Sam Doosti did an expedient technical support on the phone during first respond, and Doug Dewar manned the most needed Command Center. Well done! Kudos! You’re truly a PYCRO – a Partner You Can Rely On!–Darren K.

  • Number One. Not just a Core One. NUMBER ONE. That’s what I say to all the work that Doug and his crew have done for me for last several years. Since I found this company: everything changed. I’m happy to have found you. The best professional HVAC work I have ever seen. Thanks Guys!–Jason K. Parsons

  • Bad weather. Tight deadlines. Unexpected problems on the site. A total disaster… and then Core One steps in. A one call in the middle of the night saves all my problems! They came, they saw, they conquered! They saved my bacon. They pulled a really tough job through, and on time. I’m impressed.  And Thank you!–John Ranter