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Markham, York Region
Furnace Installation & Replacement in Markham
Right-sized, correctly vented high-efficiency furnace replacement with a heat-loss calculation.
Most furnaces in Ontario are replaced with whatever size the old one was, which is how homes end up with an oversized unit that short-cycles for twenty years. We run a heat-loss calculation on your actual house before quoting a size.
(647) 000-0000Furnace Installation in Markham
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Local context
Furnace Installation for Markham homes
Markham heritage properties need the venting route planned around masonry that cannot simply be cored. We survey the sidewall path before quoting so the install price is the price.
An oversized furnace heats the thermostat quickly and the house unevenly, cycles constantly, wears its igniter and inducer prematurely, and never runs long enough at low fire to be efficient. A correctly sized modulating unit runs longer at lower output and holds temperature far more evenly — the comfort difference is usually more noticeable than the fuel saving.
Replacing a mid-efficiency furnace with a condensing one changes the venting entirely. The new unit vents in plastic through a sidewall, which orphans the water heater on the old masonry chimney and often requires a liner. Quotes that ignore that are quotes that will cost you again later. Ours includes the venting work, the permit and the inspection, and we hand over a commissioning sheet with gas pressure, temperature rise and static pressure recorded.
A replacement is only as good as the load calculation behind it. We size to the house — square footage, insulation, window area, air leakage and the duct system you already have — rather than matching the badge on the old unit. Most furnaces we replace were oversized when installed, and an oversized condensing furnace short-cycles, never reaches steady-state efficiency and wears its ignition components out early. Right-sizing typically means a smaller and quieter unit than the one coming out.
The parts of the job that get skipped by low quotes are the ones that determine whether the installation lasts: a correctly sized return, sealed and supported venting at the right slope, a proper condensate route with neutralisation where required, a new gas connection and shut-off, and commissioning readings recorded at the end. We file the permit, book the inspection and leave you the manufacturer registration completed so the warranty is actually valid.
What the housing stock in Markham means for this job
Cornell, Berczy Village, Cathedraltown and Box Grove are planned post-1995 communities with rear-lane garages, narrow lots and mechanical rooms designed to the minimum footprint. Unionville and Main Street Markham hold protected heritage properties where any exterior work has to respect the original materials. For furnace installation, that matters because the work concentrates on sizing, venting and commissioning — and that is exactly what changes between a Cornell property and a newer build in Berczy Village.
Timing in Markham
Planned replacements are cheapest and easiest to schedule in spring and early autumn; emergency replacements in January cost more and offer far less choice of equipment. In Markham specifically: Markham's inland position gives it colder winter nights than the lakeshore and a longer heating season than downtown Toronto, and its newer neighbourhoods have limited mature canopy, so summer roof and attic temperatures run high.
What it costs here
Efficiency tier and staging drive equipment cost; venting changes, duct or return modifications and permit work drive installation cost. Rear-lane and narrow-lot homes in Cornell and Berczy add access time for anything involving exterior equipment or roof work. In the heritage districts, material matching — mortar, brick, flashing detail — is the cost driver rather than labour hours.
Permits and jurisdiction
City of Markham issues permits, with heritage districts adding a separate approval step for visible exterior work. York Region covers water and wastewater; TSSA governs gas work throughout.
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- A cracked heat exchanger confirmed by inspection
- Repeated CO alarm activations
- A furnace over twenty years old that has failed mid-winter
Can be scheduled
- Rising repair frequency on a unit past fifteen years
- Uneven heating that a repair has not solved
- Planning ahead before next heating season
How a Markham visit runs
- 1Heat-loss calculationRoom-by-room sizing based on your actual insulation, windows and orientation — not the old unit's badge.
- 2Written optionsTwo or three real options with efficiency, sound rating and total installed price. No pressure close.
- 3Venting planSidewall venting, condensate route and what happens to the water heater's flue, all specified before install day.
- 4Install & permitOne-day changeover in most homes, permit filed and inspection arranged.
- 5CommissionGas pressure, temperature rise, static pressure and combustion readings recorded and left with you.
What affects furnace installation pricing in Markham
- Output capacity and efficiency tier, and whether the blower is single-stage, two-stage or modulating
- Whether the changeover requires new sidewall venting and a chimney liner for the water heater
- Condensate drainage — a basement without a nearby drain needs a condensate pump
- Existing ductwork condition and whether the plenum and return need modification
- Available manufacturer and utility rebates, which we apply for on your behalf
FAQ
Furnace Installation questions from Markham homeowners
How long does a furnace replacement take?
A straight changeover is a single day. Adding sidewall venting, a chimney liner for the water heater or ductwork modification can extend it to two.
What size furnace do I need?
The only honest answer comes from a heat-loss calculation on your specific home. Matching the old unit's size perpetuates whatever sizing error was made the first time, and in {city} that error is usually oversizing.
Do I need a permit to replace a furnace?
Yes, and we file it. A permitted, inspected install protects your manufacturer warranty and matters at resale.
Are there rebates available?
Manufacturer and utility programs change through the year. We check what is active at the time of your quote and handle the paperwork rather than leaving you to claim it.
What size furnace do homes like mine here usually need?
Cornell, Berczy Village, Cathedraltown and Box Grove are planned post-1995 communities with rear-lane garages, narrow lots and mechanical rooms designed to the minimum footprint. Unionville and Main Street Markham hold protected heritage properties where any exterior work has to respect the original materials. On a furnace installation visit in Cornell, Berczy Village, Cathedraltown or anywhere else in Markham, we work from what the house actually is rather than a standard checklist — sizing, venting and commissioning gets assessed on the property, and you get the readings in writing.
When is the best time of year to replace a furnace here?
Planned replacements are cheapest and easiest to schedule in spring and early autumn; emergency replacements in January cost more and offer far less choice of equipment. Markham's inland position gives it colder winter nights than the lakeshore and a longer heating season than downtown Toronto, and its newer neighbourhoods have limited mature canopy, so summer roof and attic temperatures run high. We cover Markham from Cornell through Cathedraltown, and also serve 3 neighbouring municipalities, so scheduling outside a demand spike usually means a same-week window.
Pricing
How much does this cost in Markham?
Typical range is $3,800 – $8,200 installed. Get a number for your own home in about a minute with our instant estimator.
Furnace Installation in Markham, booked today
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