• Fireplace Installation Toronto

    HVAC System

    I found this company on the web and I have not regretted it since. I hired them to do a complete HVAC system in my home. Nando was the person who came out, for the site survey and within a week they installed all the equipment. The technicians are very professional and ensured they rolled out their red carpets in my home, so they wouldn’t damage my floors. Many thanks to the Keystone crew!! I would recommend them to my family and friends.

  • Fireplace Installation Toronto

    Replace Central Air Conditioning System

    Our small office central air conditioning system failed and Nando and his team responded promptly with quote and quick turnaround. We are Engineers and Contractors ourselves and we have had Keystone help with several projects over the past few years and we can attest to their competence and professional manner of delivering service. Our office staff is once again cool and back to work! Thanks Nando and Keystone Mechanical team.

    K H Davis
  • Fireplace Installation Toronto


    Keystone completed an unexpectedly difficult install of a fireplace at my home. They went above and beyond to make the install work - running a new gas line when they couldn't tee off an existing one, and installing the exhaust vent in such a way that it minimized the protrusion into the living space. They were also far more reasonable in cost (for the unit and install) than the top rated competitor. I'd gladly recommend their work!

    Chris Perez
  • Fireplace Installation Toronto

    Amazing, Amazing, Amazing

    Theresa, Nando, Tito, Rob and Christian are all amazing! With his meticulous work ethic, Nando was great with providing information, explaining the process and answering all my questions.

    Rob, Tito and Christian worked efficiently, professionally and skillfully to get everything installed. They are technical and artistic gods.

    And, in the office, Theresa keeps everyone, and everything organized with her friendly, informed and professional manner. You are an amazing team.

    Private User
  • Fireplace Installation Toronto

    I hired the professionals at Keystone Mechanical Group to install my central air conditioner. Their technician was extremely knowledgeable and friendly. Highly recommended!

    Emily Mirkwood
  • Fireplace Installation Toronto

    I am a longstanding Keystone Mechanical customer and recommend this HVAC company. I find them professional and very reasonably priced. My furnace failed on New Years Eve (2018). They attended at 9 PM that night and work tirelessly to restore heat. Many thanks to Dominic and James!! Best, Nick Pedro

    Nick Pedro
  • Fireplace Installation Toronto

    Good service

    Flavio Soares