Furnace prices in Guelph

Old house or new house: where Guelph quotes split

Guelph packs 19th-century limestone (downtown, Exhibition Park, Old University), post-war bungalows and new south-end subdivisions into one small city. The furnace costs about the same in each house, in line with the provincial ranges on Ontario Furnace Prices. The work around it does not.

If you own a century home

Many of Guelph's oldest houses were built around coal heat and a masonry chimney. Replace a furnace that vents into that chimney with a high-efficiency model and the new one vents out the side wall through plastic pipe, leaving the gas water heater alone in a flue far too big for it. That orphaned water heater may not draft properly, so installers commonly add a chimney liner or re-vent it. It is the most common surprise on an old-house quote.

Stone adds a second problem: the new intake and exhaust must pass through an outside wall, clear of windows, doors and the gas meter, and drilling a thick limestone foundation takes time. Inside, furnace rooms are small and ducts added decades later have few returns, so upper floors run cold. A new furnace alone will not fix that; duct changes will. If old duct wrap or pipe insulation could contain asbestos, have it tested before anyone disturbs it.

Homes on hot water radiators can keep them: a heating boiler typically costs $6,000 to $11,000 (see boiler prices), and a ductless mini-split adds cooling without ducts.

If you own a newer south-end home

South-end houses were built with high-efficiency furnaces, PVC venting, a nearby floor drain and ducts sized for central air. The earliest builder furnaces are reaching the 15 to 20 years when most are replaced (see how long furnaces last), so the job is usually a one-day swap. The decisions are upgrades: two-stage adds about $1,500 at the midpoint for steadier heat, and if the AC is the same age, doing both in one visit usually beats two jobs (see furnace and AC prices).

Sizing a furnace for a Guelph winter

Heating here is sized for a cold day of about -19°C. The rule of thumb of 25 to 45 BTU per hour per square foot gives a 1,600 sq ft house 40,000 to 72,000 BTU/h. Uninsulated stone sits near the top; a tight south-end house sits near the bottom and often has a bigger furnace than it needs. A CSA F280 room-by-room load calculation is the proper method; the furnace size calculator gives a planning number.

Gas savings in an older Guelph house

Many older homes still run an 80% AFUE furnace venting into the chimney. A 96% furnace burns about 17% less gas for the same heat, and about 38% less than an original unit near 60%. Two-stage helps most here: long, low-fire runs even out a drafty stone house. Gas is delivered by Enbridge Gas and electricity by Alectra Utilities; at about 50 cents per cubic metre all in, every 1,000 m3 you stop burning saves about $500 a year. Compare a furnace and a heat pump at your rates in the heating cost calculator.

Permits and gas safety

Whether your job needs a municipal permit depends on its scope, and the City of Guelph sets those rules, so check with its building services rather than relying on a general rule. The installer usually applies, and the fee, typically $75 to $300 in Ontario, belongs on the quote. Gas work must be done by a TSSA-registered contractor; ask for the registration number, and test the carbon monoxide alarms Ontario's Fire Code requires outside sleeping areas, and since January 1, 2026, on every storey of the home.

Fergus, Elora, Rockwood, Puslinch and Arkell

Guelph installers commonly cover the nearby part of Wellington County at similar prices, sometimes with a rural travel charge. Fergus and Elora share downtown Guelph's stone-house venting questions, and homes beyond the gas main often have the strongest case for a heat pump (see heat pump prices). Next door: furnace prices in Kitchener and furnace prices in Cambridge, the provincial ranges on furnace prices in Ontario, and every city price page.