Replacing Furnaces and Air Conditioners: When Is It Time to Do It?

The following is a list of signs that indicate it may be time for replacing furnaces and air conditioners. If you notice any or a combination of these signs, have your furnace or AC checked out by a trained HVAC technician you can trust to see if they can be repaired at a reasonable cost or if it makes more sense to replace them.


  • Your furnace is more than 15 years old.
  • Your furnace needs to be repaired frequently.
  • Your heating bills are increasing.
  • Your furnace is starting to make strange noises that it wasn't making before such as grinding, screeching, banging, rattling or popping.
  • Your blower is turning on and off all the time or it is blowing cold air.

If you are not sure about the kinds of noises you should be listening for with your furnace, the following video will help you out.

If your furnace is making strange noises, then you should get it checked out

Air Conditioners:

  • Your air conditioner is only blowing warm air and never blowing cold air.
  • You notice cold air only around the vents but no cold air circulating through your home.
  • You hear loud or unusual noises coming from your air conditioner.
  • You notice a strong smell coming from your AC unit when you turn it on.
  • Your home still feels humid even when your air conditioner is running.
  • You notice refrigerant or water leaking from your unit.
  • Your hydro bill has increased considerably.
  • Your air conditioner keeps breaking down and needing to be repaired.

Replacing Furnaces and Air Conditioners: Should You Do It at the Same Time?

How about replacing furnaces and air conditioners at the same time? Does that make the most sense? The answer is that it depends. Sometimes it is the most cost-effective solution, but not always.

Consider the age of your units:

If your furnace is over 15 years old and you need a new air conditioner, then it would definitely make sense to replace them at the same time. Furnaces often last about twice as long as air conditioners, so take that into consideration when you are making your decision. If your furnace is less than 10 years old then it really isn't wise to replace it just because you need a new air conditioner.

You may want to consider replacing your furnace and AC before you retire

Consider your financial situation:

If you are planning to retire soon, you may want to invest in both a new furnace and AC unit at the same time while you are still earning and before you go on a fixed income. Having to replace your HVAC during retirement could be a huge strain on your finances.

Consider the type of unit you want:

If you want to get a high-efficiency air conditioner (one that has 21 SEER+), then you may want to get a new furnace at the same time. With higher efficiency units, purchasing matching pairs often means that they will work best together.

Replacing Furnaces and Air Conditioners: How Much Will It Cost?


The average cost to replace a furnace in Ontario is about $3,000 to $5,500 depending on which city you live in and the company you decide to go with. There are a number of factors that will affect the total cost you pay including:

  • The efficiency (AFUE rating) you choose
  • The size of the furnace you need
  • Whether you choose a single, two stage or modulating furnace
  • Having extra features like advanced humidity controls and reduced noise levels.
  • The amount of warranty that you get
  • The cost of installation

Air Conditioners:

The average cost to replace an air conditioner in Ontario is somewhere between $3,500 and $4,500. However, your highest-end prices could reach as high as $7,500 for extremely high-efficient larger units. Your total price will depend on a number of factors that include:

  • The size of the unit you need
  • The efficiency level (SEER rating) that you choose
  • Whether you choose a single stage or two stage AC
  • The type of warranty you get
  • The cost of installation

The higher the SEER value the more efficient the unit is

Replacing Furnaces and Air Conditioners: How Long Will It Take?


The time that it takes to replace a furnace will vary from home to home, but on average it can be completed in less than a day, with most installations taking between 4 and 10 hours. The actual time that the installation process takes will depend on:

  • The size of the furnace you install
  • The type of furnace you have bought as well as its energy efficiency level
  • Whether you need to repair or add duct-work
  • The expertise and efficiency of the company you hire for the installation

Air Conditioners:

On average, it will take between 4 and 8 hours to replace an air conditioner. The length of time will vary depending on:

  • The size of the unit and your home
  • The location its installed in
  • Whether you need repairs to your duct-work
  • The experience and expertise of the company you hire

Trust Draft Control to Replace Furnace and Air Conditioner

Draft Control HVAC is a highly trusted heating and air conditioning company servicing the East Ottawa region. We have gained a reputation for honest service and advice about when to fix your air conditioner and when it's time to replace it. Unlike other companies, we focus on our customers, what's best for them, and their complete satisfaction, not on the brands that we sell.  Whether you require installation, repair, or maintenance for your furnace, air conditioner, water heater, gas BBQ and fireplace, or boiler; Draft Control is there for you. Contact us today for all your heating and cooling needs.

"Selim is excellent and honest. He was very good in letting me know what my options are and what his opinion
​was based on his experience. I trust him."

-Jan Dolfatto

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Do you need some helpful advice on replacing furnaces and air conditioners? Read on and then contact Draft Control for additional expert advice.

the ultimate guide to replacing furnaces and air conditioning

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