Furnace Installation and Replacement in Waterloo Region

A new furnace is a 15 to 20 year decision, so the install matters as much as the brand. We install Lennox and York furnaces in homes across Waterloo Region and Guelph, from post-war bungalows in Kitchener and Galt to newer two-storeys in Laurelwood, Doon and Guelph's south end.

Every new gas furnace sold in Canada since 2019 has to be at least 95% AFUE, so efficiency between brands is closer than ads suggest. The differences that matter are the burner and blower type, correct sizing, and how well the ductwork, venting and gas piping are done. For city-specific detail, see furnace installation in Kitchener, Waterloo, Cambridge and Guelph.

For most Waterloo Region homes, a two-stage furnace with a variable-speed blower is the best balance of comfort and price. Single-stage is the budget choice; modulating is the comfort choice.

• Single-stage runs at full fire every time. It works, but it's louder and gives bigger temperature swings.
• Two-stage runs on low fire most of the winter and switches to high on the coldest days. Quieter, steadier heat.
• Modulating adjusts the flame in small steps to match the heat the house is losing. The most even temperatures and the highest efficiency ratings, usually 97% to 98% AFUE.

A variable-speed (ECM) blower motor uses much less electricity than an older PSC motor, which matters if you run the fan continuously or have central air.

The right furnace size comes from how much heat your home loses on the coldest days, not from the label on your old furnace. We size the equipment to your home, its existing system and how it's been performing.

Many older homes in the region have furnaces that are far bigger than they need to be, often because insulation, windows and air sealing have been upgraded since. An oversized furnace short cycles, wears out sooner and leaves rooms uneven. We look at your square footage, insulation, windows and how the current furnace keeps up, with Waterloo Region's winter design temperature of around -19°C to -20°C in mind. If your ductwork is undersized for the new equipment, we'll tell you before we install, not after.

In Waterloo Region, a replacement high-efficiency gas furnace for a typical detached home usually falls somewhere in the mid four figures to around $10,000 installed. Two-stage and modulating models, venting changes and ductwork repairs push it higher.

That's a typical market range, not our price. Your quote depends on the furnace model, the size of your home, venting and gas line changes, and whether you add central air or a heat pump at the same time. Our furnace replacement cost guide breaks it down.

Ontario's current rebates focus on heat pumps rather than gas furnaces. If you're replacing a furnace and an older air conditioner, it's worth asking whether a cold-climate heat pump paired with the new furnace qualifies; see our Ontario heat pump rebate guide and check current eligibility. Spreading the cost with furnace financing is also an option.

Buying a furnace almost always costs less than renting one over 15 years. Rental contracts can look cheap per month, but the payments often add up to well over the price of the equipment, and buying out or ending a contract early can be expensive.

If you already rent, read our guide to renting vs buying a furnace or water heater before you sign anything new. Under consumer protection changes Ontario passed in 2017 (in force since March 2018), most unsolicited door-to-door contracts for furnaces, air conditioners and water heaters are banned, so be cautious of anyone who shows up at your door offering a "free" upgrade.