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Your #1 HVAC Company in The GTA

Reliable HVAC & Gas Contractors in Toronto

Expert Analysis… Trusted Solutions

Welcome to DeMarco Mechanical Services Inc., a heating, cooling and gas specialists that deliver top quality products and services. We stand behind each installation, replacement, maintenance and repair, ensuring our customers get the right recommendations that fit their budget in a cost-effective way. DeMarco Mechanical offers energy efficient residential & commercial furnaces, tank-less water heaters, air conditioners, gas lines and more. We also specialize in indoor air filtration systems, duct cleaning services and indoor humidification. Our certified and licensed technicians pay attention to details and will guarantee a trouble-free system that will last for years to come.

Residential & Commercial HVAC Services


Leading HVAC Contractor in Toronto

Best of Homestars 2019

valuable customer service

Summer Blowout Sale

Start your Summer with a breeze of fresh air! Choose one of our three amazing promotions!


Promo 1


  • Get $500 Off towards any Ducane air conditioner!
4AC13L – Ducane™ Air Conditioner
demarco mechanical services logo

Promo 2

Heat Pumps Rebate

  • $5000 or more rebate on Heat Pumps(Hyper Heat Ductless System)

Promo 3

ecobee pro 5
$500 Installation with any ECM Furnace + Free Ecobee 5 pro thermostat.

Our Featured HVAC Services in the GTA

DeMarco Mechanical Services Inc. offers a variety of programs that can be scheduled on a regular basis for maintaining your Heating, Air Conditioning, Gas & Air Filtration (HVAC) units. Our team of Toronto HVAC contractors offers top-quality service while maintaining the health and well-being of each of our customers and their installed products. We work with both residential and commercial properties across the GTA.

Preventative maintenance is essential to keep any heating and cooling system running safely and at its full efficiency capability. As units age their components suffer wear, and chances are there will eventually be a failure. Having an annual inspection done by licensed HVAC contractors can mean the difference between you being comfortable and worry free all year round, and waiting for a part for your furnace at -25°C.

expert furnace services


An efficient furnace does not only provide a comfortable home during the cold Canadian winter, but it will also ensure substantial energy savings that accumulate over the years.

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air conditioning service

Air Conditioning

Heat waves do appear in Canada from time to time. Thus, we are always highly reliant on the efficiency of our air conditioning units. We offer a wide range of quality Air Conditioning products and services.

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gas line services Toronto


We are committed to providing our customers with top-notch gas services from start to finish. Whether you need help with replacement, installation or repair, we got you covered.

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Air purification services

Indoor Air Quality

Improve your indoor air quality with duct cleaning and a new filtration system, we have the team to get the job done for you efficiently and cost effectively.

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Downtown Toronto, North York, Etobicoke, Scarborough, Thornhill, Markham, Richmond Hill, Vaughan, Concord, Aurora, Woodbridge, Maple, King City, Newmarket, Stouffville, Pickering, Ajax, Whitby, Oshawa