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A new furnace, sized for your home and Installed right

The First Time.

Replacing a furnace is a decision you live with for more than a decade, so you should have time to understand your choices. When the old unit is failing or no longer fits the house, Markham Heating sizes the system to your home, lays out the equipment and warranty options, and gives you a complete estimate to review on your own time. Once you approve it, our install team will schedule a time at your convenience to get this done with ease and efficiency.

Book a free estimate Call (905) 471-1748

★★★★★Google100+ 5 Star ReviewsFree in-home estimatesFinancing available

Furnace Install Clean - Markham Heating & HVAC

Why Choose Markham Heating and Air Conditioning Systems

Family-owned since 1983

TSSA-Registered

WSIB Registered

1000+ Training Hours

100+ 5 Star Reviews

SIGNS YOUR SYSTEM IS WORKING TOO HARD

Choosing a unit solely on price or convenience can cause long term harm to your home and comfort

A furnace that’s too big heats the house in short bursts, wears out faster and still leaves some rooms cold. Too small, and it runs all day on the coldest nights. Either way you feel it on the gas bill and in the rooms you actually use.

Before we quote, we look at your home’s size, insulation, windows and ductwork, then size the furnace to match. You get two or three options in writing, with the price, so you can choose without anyone pushing you.

The wrong size costs you for years

Do these sound familiar? Consider a replacement.

It's 15 years or older

Most furnaces start losing efficiency and reliability somewhere past 15 years, even with good maintenance.

Repairs keep coming back

When repair bills start stacking up, putting that money toward a new system often makes more sense.

Gas bills keep climbing

An older furnace working harder each winter usually shows up on the bill before it stops working.

Some rooms never feel right

Cold bedrooms, a stuffy main floor, or a furnace that runs and runs can mean it no longer fits the house.

New noises or short cycling

Banging, rattling, or a furnace that keeps starting and stopping usually means parts are wearing out.

You've renovated or added space

A finished basement or an addition can leave the old furnace undersized for the home you have now.

Not sure? We’ll tell you honestly if a repair makes more sense. See furnace repair

What’s included

Everything a proper install should include, in the quote before we start.

Finished Install Workmanship - Markham Heating & HVAC

Every furnace installation includes:

Heat loss calculation to size the furnace
Gas permit and inspection
Removal and disposal of your old furnace
New venting, condensate drain and gas connection, done to code
Thermostat hookup
Floor protection and a full clean-up
Startup, combustion and safety testing
A walkthrough of your new system, and we register your warranty

How it works

Four simple steps, start to finish.

You’ll know what’s happening, what it costs and when we’ll be there.

01

Free in-home estimate

We come out, look at your current setup and measure what your home needs.

02

Clear options in writing

Two or three choices with the full price, so you can compare at your own pace.

03

Installation day

Most replacements take one day. We protect your floors, install, test and clean up.

04

Walkthrough and follow-up

We show you how everything works, register your warranty and check in afterwards.

Book a free estimate

The equipment we install

We install brands we stand behind and can get parts for quickly. We’ll recommend the model that fits your home and budget.

Spread the cost with financing

A furnace usually isn’t something you plan for. Monthly payments are available through Klarna, subject to approval.

Ask About Financing

Outdoor Heat Pump Local Home - Markham Heating & HVAC

Thinking about a heat pump too?

A cold-climate heat pump can work alongside a new furnace, heating your home on milder days and cooling it in summer. Rebates may be available depending on your home and fuel type. We’ll walk you through what applies to you.

Learn about heat pumps

Protection Plans

Keep your new furnace running like new.

A yearly tune-up helps keep your warranty in good standing and catches small problems early. Plan members get annual maintenance, priority booking and savings on repairs.

See Protection Plan

Core Comfort

$20/monthOR $240 / yr + tax

Annual furnace tune-up, priority scheduling and repair discounts. Premier plan also available.

What our customers say

★★★★★Google100+ 5 Star Reviews

    
 
 
       Posted on Google  
   
   Nick/Maria Addante 
 
 
 
 Trustindex verifies that the original source of the review is Google. We had our gas furnace and two fireplaces serviced for the upcoming winter season.  Our technician Tom was very professional, knowledgeable and courteous.
We are definitely planning to use Markham Heating & Air Conditioning again in future.
  
 
      Posted on Google  
   
   Lawrence 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great communication and great service. Tom and Mitchell were very professional. Found the issue quickly and had it repaired quickly
  
 
      Posted on Google  
   
   Teresa Muto 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service! Had a pool heater repaired, done fast and a lot less then I had been quoted by other places.
  
 
      Posted on Google  
   
   Allan Tieu 
 
 
 
 Trustindex verifies that the original source of the review is Google. My wife and I are so glad to have had the team at Markham HVAC replace our combi water heater and humidifier. They were fantastic from my first interaction with them to when they finished. Vijay, Mitchell and Todd were accommodating to our needs, thorough and knowledgeable when it came to explaining what was being installed, how they would install it and what the next steps were. The crew were extremely respectful of both my time and home and did their absolute best to make sure my home was as clean when they finished. We hit some roadblocks during the install but again, Vijay and Mitchell were always transparent with the whole process. We highly highly recommend this team as they know what they’re doing, they’re extremely professional and easy to reach at any time of day with quick responses. Thank you again for all your help! We will be reaching out for any other HVAC upgrades to our home.
  
 
      Posted on Google  
   
   Gianfranco 
 
 
 
 Trustindex verifies that the original source of the review is Google. Mitchell was excellent in explaining and servicing our multiple mini splits. The service was thorough, well priced, and informative.

We will definitely be calling Markham Heating & Air Conditioning next year for our yearly maintenance.
  
 
      Posted on Google  
   
   edwardwhitfield1 
 
 
 
 Trustindex verifies that the original source of the review is Google. Installation of my furnace was prompt, efficient, and very courteous. I highly recommend Markham Heating and Air Conditioning.
  
 
      Posted on Google  
   
   James Guy 
 
 
 
 Trustindex verifies that the original source of the review is Google. Excellent friendly service! After the first visit my HVAC issue wasn’t completely solved, but there was fast follow up to resolve the issue the following day, with no hassle. I highly recommend!!
  
 
      Posted on Google  
   
   Abdool Karim 
 
 
 
 Trustindex verifies that the original source of the review is Google. Tom the technician arrived on time and was very pleasant, professional, and truly knowledgeable. He serviced my water heater, furnace, and A/C. He explained every step in the process and gave me valuable advice. Markham Heating has been replacing and servicing my equipment for the last 20 yrs and I have always had outstanding service
  
 
      Posted on Google  
   
   Miles Buchanan 
 
 
 
 Trustindex verifies that the original source of the review is Google. Mitchell showed up, diagnosed the issue quickly and correctly and had me all fixed up in no time.  As always stellar service!
  
 
      Posted on Google  
   
   Mark Shnier 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had a wonderful experience working with Markham HCAC. I had called them in because the master bedroom was just way too hot in the summer despite me having a very up-to-date heat pump and furnace set up for the whole house. Their technician, Mitchell, came in and we tried to find if there was any easy solution with improving the ventilation, but the master bedroom being on the second floor at the opposite end of the house was just too far from the main central system to get enough airflow on those really hot summer days.

So in the end they recommended the only solution was a ductless split system, and they treated that time spent with me as a sales call as opposed to charging me for their time.

I wanted my own Electrician to run the electrical to the termination point outside and once I had that arranged, the installation was done very quickly and I'm very happy with the result. They also did a beautiful job with the "line hide",  As you can see from the pictures, we decided it would look best if they ran it upright tight against the vertical downspout and it came out looking very clean outside.

Related furnace services

More ways to keep your home warm

Furnace Repair

No heat, strange noises or a furnace that keeps shutting off. We find the cause and explain the fix before we start.

Furnace Repair

Furnace Maintenance

Our 18-point tune-up catches small problems before the first cold snap and helps keep your warranty valid.

Furnace Maintenance

All Furnace Services

Installation, repair, maintenance and free estimates, all in one place.

View all furnace services

Furnace installation questions

How much does a new furnace cost?

It depends on the size your home needs, the efficiency level you choose and whether any venting or ductwork changes are involved. After a free in-home visit, we give you options in writing with the full installed price, so there’s no guessing.

How long does installation take?

Most furnace replacements are done in one day. If the venting, gas line or ductwork needs changes it can take a little longer, and we’ll tell you before we start.

Will a new furnace fit where the old one was?

Usually, yes. High-efficiency furnaces sometimes need new venting or a condensate drain, and that’s included in your quote if it’s needed.

Do you take the old furnace away?

Yes. Removal and disposal of your old furnace are part of every installation.

What warranty comes with a new furnace?

Your furnace comes with the manufacturer’s parts warranty, plus our own labour warranty. We register it for you on installation day.

Should I replace my air conditioner at the same time?

If your AC is getting older, replacing both together can save on labour and makes sure the two are properly matched. We’ll price it both ways so you can decide.