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Professional HVAC Services

Heating Furnace Repair in Durham Region

We take care of all areas of your home’s HVAC so you can spend more time on the things that matter.

905 242 6693
certified HVAC Toronto

Certified and Insured Technician

Trust in the expertise of a certified and insured technician.

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Emergency Services

Stay calm in any heating or cooling emergency with our 24/7 emergency services, providing fast and reliable solutions.

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Peace of Mind Guarantee

Equipped with the knowledge and skills to handle all of your heating and cooling needs.

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Since 2014

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get everything you need…
and then some

The all-in-one HVAC Service with more “all.”

Red Seal Mechanical is a Bowmanville HVAC company that was established in 2014. With a family-run approach, Red Seal extends that level of personal touch to its customers and treats every home they walk into as if it was their own. We understand that your family’s comfort and safety is important, you need the right help then and there, which is why our service is rated so highly on review sites, like HomeStars.

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HVAC / reliable / professional

Responsive, Reliable HVAC Help When you Need it Most

Our team of experts are ready to install, replace, service or repair your heating, cooling or water heating systems!
Proudly Serving Durham Region – Pickering, Ajax, Whitby, Oshawa, Courtice, Bowmanville and Newcastle.

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Keep it cool A/C Services

Air conditioner installations, maintemnance and repairs of all types of air conditioning units.

gas fireplace repairs

Hassle-Free Heating services

Repair, installations and maintenance of furnances, hot water tanks, gas ranges and more.


Gas Line Installations

Ensure the safe and proper installation of your gas lines by a certified technician, dedicated to delivering top-notch service.

furnace repair

Noisy and finicky Furnace

Don’t let your heating system leave you in a deep freeze this winter. We repair all furnace models.

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Durham Region’s heating and cooling specialist

air-conditioner maintenance

Schedule your
A/C maintenance

With summer right around the corner it’s a good idea to have your A/C inspected by your local air conditioning technician.

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Schedule your Furnace Maintenance

Regular tune-ups help your furnace have a longer life cycle, heat correctly and deliver the greatest efficiency possible.


Schedule a pre-season maintenance

Keeping you cool in the summer and warm in the winter. Seasonal heating and cooling system maintenance can save you money.


heating services

Say good bye to a frigid home

Stay cozy and comfortable all winter long with our top-notch heating services, delivering warm solutions to keep you and your loved ones toasty and happy.

Repairs, maintenance and installations:

To ensure your home comfort, we focus on the details.

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There’s no such thing as a hot home with an A/C repair.

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cooling services

Don’t suffer another hot summer

Beat the summer heat with our expert home cooling services, offering personalized solutions to keep you and your family comfortable and refreshed all season long.

Repairs, maintenance and installations:


Why Clients in Durham Region and the GTA Trust us

Reasons to Love Red Seal Mechanical

Air Conditioners
Lee is willing to work with older air conditioner units in two Whitby locations. Due to supply shortage it is challenging to find new units so Lee effectively and professionally manages the two units in a very timely manner. His prices are very reasonable. He offers well informed choices. I have hired him for 4 jobs so far and he has rated 10/10 on each one.
Gas line installation for stove
Lee was awesome! Personable, punctual and professional. He came by and explained everything we needed and as soon as the appliance arrived he came the next day to install. We will be highly recommending Lee to anyone we know who needs gas fitting services. Looking forward to having him back in the spring for a BBQ line install
Hot Water Heater Replacement
Lee was able to able to get us out of a bind when our tank died suddenly. He sourced and installed a new commercial grade tank for us all in a matter of hours. He was able to answer all of our questions so that we could make informed decisions on how to proceed. Lee has also helped us out in the past when we had a small gas leak with our fireplace. He came out right away, made the repairs and was able to turn the gas back on to the house. Would reccomend Lee to anyone.
New gas line and gas range install and New Furnace
1. Lee was recommended by our neighbour and I will now be referring him to clients, family and friends. We first called him after ordering our new gas range. When it arrived, he came the next day to install a new gas line and connect the range. He was professional, on time, respectful, friendly, transparent and skilled. Amazing work ethic and service! 2. We recently had our 40 year old clunker of a furnace stop working and Lee came right away. He diagnosed the issue and shared our options with us in a clear and no pressure way. He was well prepared, respectful and so knowledgeable. We are so pleased with all the work Lee has done for us and highly recommend his services for all gas fitting needs. Thank you Lee!
Gas Stove installation
Lee was very professional and was very flexible with time that worked for us. He even showed up early to inspect our pool heater which he didn't even charge us for. He hooked up our gas stove in no time and tested everything to make sure it was good to go. Other companies quoted ridiculous minimum fees and hours needed in order to send a technician. I would definitely recommend Red seal to friend and family.

Certificates, Associations and Memberships


keeping you cool in the summer and warm in the winter

Get started with
Red Seal Mechanical