What we do
Thermex Heating and Air Conditioning Inc. installs and services residential heating and air conditioning systems. We hold a TSSA Fuels Contractor Authorization (FS-R-50283) covering natural gas and propane work. We work on heat pumps, air conditioners, condensing furnaces and gas appliances, and on everything to do with getting exhaust out of a building: venting design, chimney relining, draft testing, combustion air corrections.
We are not a comparison portal and we are not a lead broker: the site visit, the quote, the installation and the service afterwards are all done by our own people. The company that signs the heat loss calculation is the same one that pulls the permits and answers for the maintenance.
How we work
Every job starts with a free site visit. We assess the existing system, how well the building is insulated, whether the duct runs are sized for a lower supply temperature, the capacity of the electrical panel and the condition of the flue, then we run the heat loss calculation to CSA F280-12. The quote we hand over is written, itemized line by line, and comes with the calculation attached. If a system is not worth it for your building, we say so before the quote, not after.
When the work is finished you get the ESA inspection certificate for any new electrical circuit, the TSSA notification where gas equipment was touched, the commissioning sheet with the changeover point recorded, the equipment data sheets and — where applicable — the documentation your rebate application needs.
The venting side
In day-to-day practice, the part of a system that causes the most trouble is almost never the machine: it is the vent. Pull a mid-efficiency furnace off a masonry chimney and the gas water heater is left orphaned on a flue sized for two appliances. The exhaust cools too fast, condensate attacks the liner, and in the worst case the draft reverses into the house. The fix is relining to the correct diameter under CSA B149.1, converting the water heater to power vent or to a heat pump model, or properly decommissioning the flue — and it is best dealt with in the same job as the heating equipment.
That is also why we keep both trades in house: when the heating system and the venting go to two different companies, responsibility tends to bounce back and forth, and the homeowner is the one who pays for it.
Rebates and paperwork
We prepare the technical documentation required for Home Renovation Savings, the Ontario program delivered by Enbridge Gas and Save on Energy,. The rebate is paid out through a contractor registered with the program, so check the contractor's registration before you sign anything. One point to be clear about: confirming that you personally qualify is between you and the program administrator, because it depends on things that have nothing to do with the equipment — who owns the property, what fuel is on record, how it is occupied. What we supply is correct and complete technical documentation.
We also tell people plainly what has closed. The Canada Greener Homes Grant stopped in February 2024, the interest-free Greener Homes Loan closed to new applications on October 1, 2025, and the Oil to Heat Pump Affordability program took its last applications on July 31, 2026. A new federal National Heat Pump Rebate was announced on October 8, 2026 and is expected to open in early 2027. Anyone still quoting you the $40,000 federal loan in 2026 is working from an old brochure.
Quality and warranty
We fit equipment from manufacturers with a parts and service network in Ontario, because a warranty is worth exactly as much as the availability of the parts. Every job ends with the inspection certificates and the full technical file, so the system stays on the record and future maintenance can be done without surprises. Anyone on our crews who opens a refrigerant circuit holds a valid ODP card, as the federal Halocarbon Regulations require.