Providing quality heating, ventilation and cooling services to the GTA and surrounding areas for over a decade.

Your Comfort, Our Mission.

We offer 24/7 emergency repairs and same day service to get your home back to the perfect temperature

Services

An outdoor air conditioning unit mounted on a brick wall of a building, with a window and some leaves in the background.
This image shows a basement utility area with a gray furnace, a stainless steel water softener labeled 'ULTIMATE', pipes, a yellow gas line, and ductwork.
A gray water heater tank connected to copper pipes with shut-off valves, mounted in a utility closet.
Two white tankless water heaters with digital displays mounted on a black wall, connected by copper and black pipes in a utility room.
A utility room with copper pipes, a hot water heater tank, and various plumbing and heating components mounted on a diamond plate wall, with a rough concrete floor.
Air conditioning unit installed outside a modern house, surrounded by green plants and a well-maintained lawn.
Outdoor view of an air conditioning unit mounted on a brick wall of a house, with a grassy yard and neighboring houses in the background.
A man wearing a white safety helmet, safety glasses, and a checkered shirt inspects HVAC ductwork with a handheld device in a commercial or industrial setting.
A freshly dug trench in a backyard with a yellow conduit pipe running through it, surrounded by grass, soil, and some landscaping rocks.
Two construction workers with helmets working on an air conditioning unit on a rooftop under a blue sky with clouds.
Home water softener system with a salt tank, a large storage tank, and associated plumbing in a laundry room or utility space.
Living room with a fireplace, wood dining table, and chairs, sunlight through windows, and decorative items on built-in cabinets.
Two male technicians wearing safety gear inspecting large industrial air conditioning units outside.
Backyard with air conditioning unit and two propane tanks near a white house with two windows, green grass, and shrubbery.
Two people working at a desk with a laptop, calculator, and documents; one is holding a calculator, and the other is pointing with a pen.

About Us

For years our founders worked at large HVAC corporations across Ontario. We learned the ins and outs of the industry and acquired a comprehensive background in both residential and commercial HVAC. But we saw a gap; many of these big companies lost the community focused touch that Toronto homeowners deserve.

Three construction workers are smiling and chatting in a basement. They are wearing black work clothes, and tools are scattered around them. One worker is gesturing with his fists, while the others listen.

We started Sentinel Heating & Cooling Ltd. to bring that expertise back to our local neighbourhoods, providing high quality heating and cooling that fits your family’s budget.

Why Choose Us?

Transparent & Reasonable Pricing

Quality service shouldn’t be a luxury. We believe in upfront, fair pricing without the markups.

Licensed Professionals

Our team is comprised of skilled technicians who are fully licensed and insured.

Locally Owned & Operated

We’re in the neighbourhood, ensuring your system gets serviced without the corporate wait times.

Experienced & Skilled

We are high level problem solvers that bring decades of collective field experience to every job site

Four workers wearing dark uniforms kneeling on the grass in front of a brick wall with utility boxes and plants.

At Sentinel Heating & Cooling Ltd. we believe in more than just fixing furnaces, we believe in building a future for our community. By partnering with high school co-op students and recent college graduates, we provide hands on mentorship that bridges the gap between classroom theory and real world experience. When you choose us, you are supporting a team that values education, local talent and the long term growth of the skilled trades in Ontario.

Testimonials

  • “We suddenly found ourselves without a furnace 2 weeks before Christmas. Not only was AJ able to diagnose our issue over the phone (the same issue it took another company 2 visits to diagnose) but he organized a crew and got us a brand new furnace installed the next day. They were incredibly quick, polite and professional. He gave us an outstanding price and there was never any pressure to go “top of the line.” It’s heartwarming to know there are still people out there, like AJ, who genuinely care about helping.”

    — Meghan Rainbird

  • “AJ and his crew were great. I had 3 quotes from other companies and Sentinel was the most fair. AJ and his crew were professional, friendly, respectful of my home, and made sure to explain all work that was being done. I would highly recommend Sentinel Heating and Cooling.”

    — Larissa Barr

  • “The team at Sentinel Heating and Cooling delivered outstanding service from start to finish! They were professional, knowledgeable, and highly efficient, making the entire upgrading and installation process seamless. From the initial consultation to the installation, their attention to detail was exceptional. They also made sure to clean up and leave everything tidy after the job was done. The team patiently answered all my questions and ensured I was completely satisfied with the work. I highly recommend them to anyone seeking reliable, top-quality service!”

    — Mccrae Family

  • AJ and his crew installed a heat pump for us after our 20 year old A/C gave out. He advised us on all the options and the pros/cons of each. His price was more than reasonable and based on his knowledge, I was confident even before the start of the job. He didn’t disappoint! The installation was impeccable. He left the site cleaner than when he arrived and the heat pump he installed is awesome. In fact, he ended up charging me less than he quoted because he didn’t use all the materials in his initial quote. My wife and I couldn’t be happier. Highly recommend them! Update: We had AJ back to install a new hot water tank and water softener. All I can say is…WOW!!! These guys are super skilled.

    — Chris

  • Had a great experience with Sentinel Heating & Cooling and highly recommend them. The team was professional, knowledgeable, and transparent throughout the process. They replaced my 20+ year old furnace and hot water tank with a tankless system, and I really appreciated their integrity in quoting and managing the project. Sentinel is also well-versed in the latest technologies and environmentally friendly options like heat pumps. Definitely worth reaching out for an estimate!

    — Marc Henry

  • AJ installed a new air conditioner unit for me, and I’ve also referred him to other family members for furnace installs as well. Whether it be general maintenance or complete replacements, AJ and his crew are the best in the business! Very prompt service, often times same day! Taking care of his customers, ensuring they are comfortable and safe is a priority to him. AJ is a great HVAC technician, but he’s also an amazing human as well. I highly recommend giving him a call for all your HVAC needs.

    — Michael Luke

  • AJ and his crew made a stressful situation easy. Honest advice. Replaced my furnace with speed and quality workmanship. The fellas worked hard, were very nice, informative and they cleaned up after themselves! Fantastic! Thank you all so much

    — Brenda Adams

  • Sentinel Heating & Cooling exceeded my expectations! They came and installed a new boiler for me. Their pricing was significantly better than the competitors, which was a huge plus. AJ and Kwayme were fantastic—always responsive, trustworthy, and provided clear, sound advice throughout the process. They didn’t just install and leave; they came back to make sure everything was working perfectly. Above all, they made me feel like I could truly trust them, which is rare in this industry. Highly recommend Sentinel Heating & Cooling for anyone looking for reliable service and great value!

    — Erik Axell

  • I wish all professional contractors were as respectful, skilled and fair as these guys. My hot water tank started leaking and flooded my basement. A coworker recommended Sentinel saying they were amazing. I had the same exact experience. I called at 7:30pm and had my tank replaced next day at a super price. The two workers were so nice and respectful and the job is beautiful. I have since found out the price was a few hundred dollars better than standard.

    — Shahram Goshtasbpour

  • AJ and his team have been there for me and my family in some of our *coldest* moments. He and his entire team respond quickly and professionally with a sense of urgency. They are my first recommendation for anyone looking for professionals in HVAC.

    — Cara Zoffranieri

Contact Us

Request a free, no obligation estimate for your next HVAC project

Contact:

(647) 448-2544

sentinelheating@gmail.com

Location:

62 Cromwell Avenue, Oshawa L1J 4T6

We service the GTA and surrounding areas

Hours of Operation:

Monday - Sunday : 8 am - 8 pm

Phone line open for 24/7 appointment scheduling

Reliable comfort for every season. Expert HVAC repairs, installations, and maintenance you can trust.