New Construction
New Home HVAC Rough-In in Trenton & Quinte West
Getting the HVAC right in a new home starts at the framing stage. Johnston Mechanical HVAC LTD handles complete mechanical rough-ins for new home construction in Trenton, Quinte West, Belleville, and Brighton — furnace, ductwork, HRV, gas lines, and more. Brandon personally oversees every project from rough-in through final commissioning.
New construction HVAC is more than dropping in a furnace. It requires coordinated planning with your builder — duct chases in the right locations, proper return air paths, gas line routing before drywall, and HRV integration that meets Ontario Building Code. Getting these decisions right at the framing stage is far less expensive than correcting them after the walls are closed.
Brandon works directly with builders and homeowners from the framing stage through final commissioning. Every rough-in is designed using proper Manual J and Manual D calculations to ensure the finished system delivers comfort in every room — not just the rooms closest to the furnace.
Johnston Mechanical handles the complete mechanical scope for new residential construction: forced-air furnace and ductwork, central air conditioning, heat pump systems, HRV or ERV ventilation, gas lines for the furnace, water heater, fireplace, and range, and tankless water heater installation. Coordinating all of this through one TSSA certified contractor simplifies scheduling, reduces conflicts between trades, and gives you a single point of accountability.
Ontario Building Code requires an HRV or ERV in all new residential construction. Johnston Mechanical installs Panasonic HRV and ERV systems, which are among the most reliable and energy-efficient units available. Brandon sizes the ventilation system to the home's volume and airtightness to meet code requirements and deliver genuine indoor air quality improvement.
A written quote is provided after a site visit or review of the construction drawings. Brandon does not quote new construction work over the phone — the scope varies too much between projects to give a number that means anything without seeing the plans.
Johnston Mechanical serves builders and homeowners across Trenton, Quinte West, Belleville, Brighton, Frankford, Stirling, Campbellford, and surrounding Hastings County and Prince Edward County. If you are building in the area and want a TSSA certified mechanical contractor who will be on-site and accountable, call Brandon directly.
Homeowners in Brighton and Belleville can find dedicated information about HVAC services in their area — see our Brighton HVAC page and Belleville HVAC page.
What's Included
- Site visit or drawing review and written quote
- Forced-air furnace supply and installation
- Complete ductwork design and installation
- Central AC or heat pump rough-in and installation
- HRV or ERV supply and installation
- Gas line rough-in for all appliances
- Tankless water heater supply and installation
- Full system commissioning and homeowner walkthrough
- 5-year labour warranty (10-year upgrade available)
- TSSA certification documentation
Frequently Asked Questions
When should I bring in the HVAC contractor on a new build?
As early as possible — ideally before framing is complete. Duct chases, return air paths, and gas line routes need to be planned before walls are framed and insulated. Calling after drywall is up limits your options and increases cost.
Is an HRV required in new Ontario homes?
Yes. Ontario Building Code requires a heat recovery ventilator or energy recovery ventilator in all new residential construction. Johnston Mechanical installs Panasonic HRV and ERV systems and handles the required inspections.
Can Johnston Mechanical handle the full mechanical scope on a new build?
Yes. Brandon handles furnace, ductwork, AC or heat pump, HRV, gas lines, and tankless water heater — the complete HVAC and gas mechanical scope. Coordinating all of this through one contractor simplifies scheduling and gives you one point of accountability.
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
Get a Written Quote — No Obligation
Pricing is provided after a site visit. No made-up numbers over the phone — just an honest assessment from a TSSA certified technician.