Sized to the house, not to the old label
Most furnaces in older Hamilton and Dundas homes are oversized. An oversized furnace fires hard, satisfies the thermostat in a few minutes and shuts down, over and over. That short cycling wastes gas, leaves rooms far from the furnace cold, and wears out igniters and blowers years early.
We start every replacement with a heat-loss calculation: square footage, insulation, windows, ceiling heights, exposure. Then we check the ductwork can actually move the air the new unit needs, and seal or rebalance it if it cannot. Only then do we recommend a size and a model.
High-efficiency, single-stage, two-stage or modulating
A 96 to 98 percent AFUE condensing furnace uses roughly a fifth less gas than the 80 percent mid-efficiency units installed through the 1990s and 2000s. Two-stage and modulating models run longer at lower fire, which means steadier temperatures, quieter operation and better humidity control through an Ontario winter.
We install and service the makes common in Hamilton-area homes, including Lennox, Carrier, Trane, Goodman, Amana and KeepRite, and we will explain the real difference in comfort and operating cost between the options for your home. When the cheaper unit is the right choice, we say so.
What a new furnace costs in Hamilton
Installed prices for a typical Hamilton house in 2026 run from about $4,500 to $6,000 for a 96 percent single-stage furnace, $5,500 to $7,500 for a two-stage model, and $7,000 to $9,500 for a modulating furnace with a variable-speed blower. What moves the number is the size of the unit, the state of the venting and ductwork, whether the gas line needs upgrading, and the thermostat you choose. The quote you receive is the installed price, in writing, with nothing added on the day.
Most replacements are finished in one working day. For the full breakdown, read what a new furnace costs in Ontario and when to repair and when to replace.
What a proper installation includes
Removal and disposal of the old furnace. New PVC intake and exhaust venting run to code. A new condensate drain with a neutralizer where required. Transitions and plenum sheet metal fabricated to fit, not forced. Gas line, shutoff and drip leg inspected or replaced. Thermostat wiring checked and a new thermostat fitted if you want one. Combustion analysis and a full start-up test before we leave, and the municipal gas inspection booked for you.
Gas work in Ontario must be done by technicians certified under the Technical Standards and Safety Authority (TSSA), and ours are. You receive the manufacturer warranty registration and our own labour warranty in writing, and the first annual tune-up is when the warranty clock really starts.
Rebates and financing
Rebate programs for high-efficiency heating in Ontario change through the year, and most of the current money is aimed at heat pumps and insulation rather than gas furnaces alone. We check what applies to your installation when we quote, handle the paperwork, and can walk you through financing options if you would rather spread the cost. The furnace rebates guide lists what is open now.
