Expert HVAC Services Trenton Ontario
Johnston Mechanical HVAC LTD — Licensed and Insured serving Trenton, Quinte West, Belleville, and Brighton. Brandon personally oversees every job. No surprises.
Ask Brandon about current pricing and financing options.
About Us
On-Site, Hands-On, Accountable
Brandon Johnston is a TSSA certified technician who built Johnston Mechanical HVAC LTD from the ground up. He's on-site on most jobs, directly overseeing the work and personally handling the more complex projects — no shortcuts, no surprises. Based in Trenton, serving Quinte West, Belleville, Brighton, and surrounding Hastings County.
5.0 Rating
103 Google Reviews
Reviews
What Homeowners Are Saying
Real reviews from real customers across Trenton, Quinte West, and Belleville.
100+ Google Reviews
Recommended on Facebook
“Johnston Mechanical has been an exceptional small business. Brandon is professional, knowledgeable, and truly cares about his customers. Highly recommend!”
Sarah M.
“Brandon installed our new furnace and AC. He was on time, clean, and explained everything clearly. Great experience from start to finish.”
Mike T.
“Called for an emergency furnace repair in January. Brandon was there within hours. Honest pricing and excellent work. Will use again.”
Linda K.
“Had a heat pump installed last spring. Brandon sized it properly and the system has been flawless. Very happy with the investment.”
Dave R.
“Professional, punctual, and fair. Brandon walked me through every step of the installation. Couldn't ask for better service.”
Jennifer L.
“Replaced our old oil furnace with a high-efficiency gas unit. Brandon handled the whole job — permits, gas line, everything. Seamless.”
Tom W.
“Excellent work on our HRV installation. Brandon clearly knows his trade and takes pride in doing it right. Highly recommended.”
Carol B.
Our Mission
Why Homeowners Choose Johnston Mechanical
TSSA certified, licensed, and insured. Brandon personally oversees every job — no subcontractors, no surprises. Serving Trenton, Quinte West, Belleville, and Brighton.
What We Do
Complete HVAC Services for Trenton & Quinte West
Furnace installation, AC, heat pumps, boilers, ductwork, and more — all done by Brandon Johnston, TSSA certified gas technician.
Furnace Installation
High-efficiency gas furnaces sized and installed for Ontario winters.
Learn more →Air Conditioning
Central AC installation and service for Trenton and Quinte West homes.
Learn more →Heat Pumps
Cold-climate heat pumps that heat and cool efficiently year-round.
Learn more →Boilers & Navien
Hydronic boiler and Navien combi-system installation and service.
Learn more →Ductwork
New construction rough-in and retrofit ductwork for proper airflow.
Learn more →Tankless Water Heaters
On-demand hot water with Navien and other top brands.
Learn more →HRV Systems
Heat recovery ventilators for fresh, healthy indoor air.
Learn more →Gas Lines
TSSA-certified gas line installation for appliances and BBQs.
Learn more →Maintenance & Tune-Ups
Seasonal tune-ups to keep your system running at peak efficiency.
Learn more →Ready to Get Started?
Call or message Brandon directly for a free quote on furnace installation, AC, heat pumps, or any HVAC service.
Where We Work
Serving Trenton, Belleville, Quinte West & Beyond
Johnston Mechanical HVAC LTD is based in Trenton, Ontario and provides expert heating and cooling services across the entire Quinte region — from Brighton to Belleville, Frankford to Stirling, and everywhere in between.
Trenton
Home base
Belleville
Hastings County
Quinte West
Trenton area
Brighton
Northumberland
Frankford
Quinte West
Stirling
Hastings County
Campbellford
Northumberland
Tweed
Hastings County
Picton
Prince Edward County
Napanee
Lennox & Addington
Not sure if we cover your area? Give us a call — we're happy to help.
What Our Customers Say
Alandra Emerson
October 19, 2026
Would 100% recommend Brandon, I called him in a panic with a newborn and a heat pump system that wasn't cooling our house in the middle of August, after another company gave us a ridiculous quote. He got it done for half and came the same day I called. Thank you so much.
Rijax Bloodmore
October 19, 2026
Realized my furnace went dead and made the call, had a technician in in a few hours and they found the issue had the part ordered and was installed the next day, professional kind and quick 10 out of 10 would use again.
Scott Marshall
October 18, 2026
We are new to our home, and weren't sure who to call for an outage with our home heating and cooling system. We found Johnston mechanical through an online search, and are very glad we we contacted them. They were honest, dependable, and fixed up our system in a professional manner. I highly recommend this business to others!
trevor roffey
October 17, 2026
Johnston Mechanical HVAC installed a radiant natural gas heater in my garage. They were professional, punctual, competitively priced and had a clean job site. Additionally, he took the time to answer my questions and explain the process. Would recommend
john flaherty
October 17, 2026
While searching for a new HVAC repair and service firm, we were pleasantly surprised when we found this company. Their response time was very punctual and the level of service we received was second to none. We had the opportunity to meet the owner Brandon Johnston and found both him and his team to be very friendly and professional. We know that our home heating and air conditioning needs are in good hands with Johnston mechanical.
Kyu Han
October 8, 2026
Look no further if you need help with your HVAC system! Brandon came very highly recommended by our next door neighbor when we had our air conditioning break this past summer and he was quick to reply, very professional, and perfectly pleasant not to mention efficient in getting our AC back up and running better than before. We are so grateful he was able to come by on such short notice and have the furnace fixed and running so quickly.