How much does a new furnace cost in Ontario (2026)?

Short answer: A new high-efficiency gas furnace installed in the Greater Toronto Area generally costs about $4,500–$8,500 in 2026. Premium modulating units, oversized homes, or installs that need new venting or ductwork can reach roughly $11,000. The right number for your home comes from a proper load calculation — never a phone quote.

What goes into a furnace price?

The "furnace cost" you see advertised is rarely the installed cost. A real GTA quote bundles the equipment, removal of the old unit, new venting, gas and electrical connections, a programmable or smart thermostat, permits, and labour. Four things move the number most:

• Size (BTU output) — matched to your home with a Manual J load calculation, not a rule of thumb.
• Efficiency (AFUE) — a 96%+ AFUE condensing furnace costs more upfront but burns less gas every winter.
• Staging — single-stage is cheapest; two-stage and modulating furnaces add comfort and efficiency at a higher price.
• Install complexity — re-venting a mid-efficiency furnace to high-efficiency, ductwork changes, or tight mechanical rooms add labour.

When does a higher upfront price pay off?

If you plan to stay in the home more than a few years, a 96%+ AFUE two-stage or modulating furnace usually earns back its premium through lower gas use and steadier, quieter heat. If you're selling soon, a reliable mid-tier high-efficiency furnace is often the smarter spend. We walk through both paths honestly before you decide.

The mistake that inflates furnace costs

The most expensive furnace is an oversized one. Bigger is not better: an oversized furnace short-cycles, wears out faster, heats unevenly, and can cost more to buy and run. A common GTA misconception is that you should "round up" to be safe for cold snaps. A correctly sized, properly staged furnace handles Ontario winters far better than a brute-force oversized one. That's why Energy Clean runs a load calculation on every quote.

Should you consider a heat pump instead?

Before you replace like-for-like, it's worth comparing. A cold-climate heat pump heats and cools from one system and can qualify for Ontario rebates — see heat pump vs furnace in Ontario and heat pump cost in Ontario. For many homes the realistic GTA play is a hybrid setup: a heat pump for most of the season with the furnace as cold-snap backup.

How to get an accurate furnace quote

Get an in-home assessment that includes a load calculation and a written, itemized quote. Ask what's included (permits, venting, thermostat, warranty) so you're comparing apples to apples. Energy Clean has served Woodbridge, Vaughan, and the GTA since 2012, and our heating and furnace estimates are free. If you already have a quote, our free second opinion tells you whether it's fair — no pressure.