Furnace
Furnace Installation in Ontario
Choosing the Right Furnace
A furnace that's oversized for your home short cycles and wears out faster, while one that's undersized runs constantly and still can't keep up on the coldest days. A proper installation starts with a load calculation based on your home's insulation, windows, ceiling height and layout rather than simply duplicating the BTU rating of whatever furnace is being removed, which is a shortcut that causes comfort problems for years.
Ontario homeowners choosing a new furnace are usually deciding between a standard 80% efficiency unit and a 95 to 98% AFUE condensing furnace that vents through PVC pipe and drains condensate. Condensing furnaces cost more upfront but use noticeably less gas over a heating season. Either way, the installation includes removing the old unit, connecting ductwork properly, running new venting if needed, and testing the complete system before considering the job finished.
Service Inclusions
- ✓ Load calculation & sizing
- ✓ High efficiency models
- ✓ Old unit removal
- ✓ Rebate guidance
Typical price range
$4,500 to $9,000
Typical Ontario price range before tax. Your actual price depends on your equipment, parts and access, and is confirmed after we assess the job.
Get a tailored estimate →When Replacement Makes Sense
Furnace is 15 to 20 years old
Furnaces in this age range are more prone to heat exchanger issues and inefficiency, making replacement worth comparing against another repair.
Repair costs keep climbing
When each service call fixes one part only for another to fail soon after, the cumulative cost of repairs can exceed what a new furnace would run.
Rooms are inconsistently heated
Sometimes the furnace itself isn't sized correctly for the home, and no amount of repair work will fix a fundamental sizing mismatch.
Planning a major renovation or addition
Adding square footage or upgrading insulation changes your home's heat loss, which may mean your current furnace is now the wrong size.
Our Installation Process
- 01
We calculate your home's actual heat loss using
Insulation, window area and layout rather than copying the old furnace's rated output.
- 02
Based on your budget
And goals, we recommend a standard or high efficiency condensing furnace suited to your gas supply and venting options.
- 03
The old furnace is disconnected
And removed, the new unit is set, connected to gas, ductwork and venting, and all joints are sealed properly.
- 04
We test combustion
We test combustion, confirm temperature rise across the furnace falls within the manufacturer's range, and check airflow at several registers.
What Installation Involves
Standard efficiency furnace installation
Generally the lower upfront cost option, suited to homes where venting through an existing metal chimney is already in place.
High efficiency condensing furnace installation
Higher upfront cost offset by lower gas bills over time, and it requires new PVC venting and a condensate drain if not already present.
Ductwork or venting modifications
Homes needing new venting runs or duct adjustments to properly connect the new furnace will see added cost beyond the base installation.
A correctly sized furnace heats evenly, runs fewer but longer cycles, and lasts closer to its full expected lifespan instead of wearing out early from short cycling. Getting the sizing and efficiency choice right during installation avoids the comfort complaints and higher bills that come from a furnace that never matched the home in the first place.
Combustion Safety
Every new furnace installation is tested for proper combustion before handover, confirming the flue gases are venting correctly and carbon monoxide levels at the registers are within safe range. If you smell gas at any point around the furnace after installation, leave the house immediately and call your gas utility or emergency services from outside. We also confirm the gas line is sized correctly for the new unit's BTU input, since an undersized line can cause pressure and combustion problems.
Planning Tips
Efficiency rebate programs change often
So check what's currently available before finalizing which furnace model to choose.
A furnace that's too large for your home actually
Performs worse, cycling on and off more often instead of heating evenly.
A higher efficiency furnace pays back its extra cost
Over several years of lower gas bills, which matters more if you plan to stay in the home.
Honest Installation Advice
We calculate proper sizing before recommending equipment, and install both standard and high efficiency furnaces across Ontario with full startup testing included.
Load calculations, not guesswork
Sizing is based on your home's actual heat loss, not the rating of the furnace being replaced.
Clear efficiency comparisons
We explain the real difference in cost and gas use between standard and condensing furnaces so you can decide with full information.
Complete startup testing
Combustion, temperature rise and airflow are all checked before we consider the installation finished.
Furnace FAQs
+How do I know what size furnace I need?
A proper load calculation accounts for your home's insulation, window area, ceiling height and layout. Matching the old furnace's rating alone can mean inheriting a sizing mistake from the original installation.
+Is a high efficiency furnace worth the extra cost?
Often yes if you plan to stay in the home for several years, since the lower gas bills offset the higher upfront price over time. Your budget and timeline both play into the decision.
+How long does furnace installation take?
A straightforward replacement using existing ductwork and venting can often be completed in a day. Adding new venting or significant duct changes extends the timeline.
+Can my old ductwork work with a new furnace?
Usually yes, though we check duct sizing against the new furnace's airflow requirements and may recommend adjustments if the old ducts were already undersized.
+Are there rebates available for new furnaces?
Rebate programs change often. We can help you understand what's currently available and what documentation is needed before purchase.
+What happens to my old furnace?
It's disconnected and removed as part of the installation, and we can discuss recycling or disposal options when we quote the job.
Where We Install
HeatNest installs furnaces throughout Ontario, from straightforward replacements to full installations in homes adding heating for the first time.
Acton · Adjala Tosorontio · Ailsa Craig · Ajax · Angus · Arva · Aurora · Aylmer · Ayr · Barrie · Bolton · Bowmanville · Bradford · Brampton · Brantford · Brooklin · Burford · Burlington · Caledon · Cambridge · Clarington · Collingwood · Courtice · Delaware · Dorchester · Dutton · East Gwillimbury · East York · Enniskillen · Erin · Etobicoke · Exeter · Fort Erie · Georgetown · Georgina · Glencoe · Grimsby · Guelph · Halton Hills · Hamilton · Hensall · Ilderton · Ingersoll · Innisfil · Keswick · Kilworth · King City · Kitchener · Komoka · Lincoln · London · Lucan · Markham · Midland · Milton · Mississauga · Mitchell · Mitchell Corners · Mono · Mount Brydges · New Tecumseth · Newcastle · Newmarket · Niagara Falls · Niagara on the Lake · Nobleton · North York · Norwich · Oakville · Orangeville · Orillia · Oro Medonte · Orono · Oshawa · Ottawa · Parkhill · Pelham · Pickering · Port Colborne · Port Stanley · Puslinch · Richmond Hill · Scarborough · Schomberg · Scugog · Shedden · Smithville · Springwater · St. Catharines · St. Marys · St. Thomas · Stratford · Strathroy · Sutton · Thamesford · Thorndale · Thornhill · Thorold · Tillsonburg · Toronto · Tottenham · Tyrone · Unionville · Uxbridge · Vaughan · Wasaga Beach · Waterloo · Welland · Whitby · Whitchurch Stouffville · Woodstock
What customers say about our furnace installation
"They walked me through repair versus replacement options without pressure. I'll be calling HeatNest again."
"Tidy, quick and thorough. Everything was tested before they left and it's been running perfectly since."
"Booking was easy and the price matched what they told me on the phone. They cleaned up after themselves too."
Start Your Project
Thinking about replacing your furnace? Call HeatNest at (289) 801-7262 for a proper sizing assessment and a clear comparison of your options.