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You’ll probably want to replace your system before it ultimately gives out. Doing so not only ensures you’ll have a functioning furnace; it can also save you money. Old furnaces have frequent breakdowns, heat your home inefficiently and can drive up your energy bills.
Have you experienced a spike in your energy bills? 
Does your furnace turn on or off when it shouldn’t? 
Maybe you’ve picked up on odd noises or gross smells coming from your heating system. 
These are telltale signs your furnace’s performance is declining.

Gas Furnace Units

Comfort on Every Level
Start looking forward to winter with an efficient, gas furnace. Featuring AFUE efficiency levels as high as 98%, you'll save money while enjoying a new level of comfort. Robust, time-tested construction ensures your furnace will provide quiet, consistent heating for years to come.

Combined Package Furnace Units 

Packaged Equipment - Comfort and Quality in One Package
Compact and efficient, Residential Packaged Equipment consolidates all the components of traditional, split HVAC systems into a single unit that sits outside your house. With a variety of air conditioning and electric and gas heating combinations, these models fit a variety of needs.

When to Replace your Furnace?

Signs your Furnace may be in trouble:

Furnace problems only become more expensive over time. Staying on top of maintenance can help you find problems sooner. If you are aware of any of these signs of trouble with your furnace, promptly schedule a repair:


You should plan on replacing your furnace as it starts to get old. An outdated furnace can struggle to adequately heat your home. High energy bills and a cracked heat exchanger are signs you should replace an old furnace.

A heat exchanger is an expensive part to replace. Old furnaces naturally lose efficiency, so there is only so much an HVAC technician can do to make an old system run more efficiently. A general rule of thumb is to never repair something when the repair costs are more than one-third the cost of a replacement. If your old furnace has needed repairs more than two times in the past two years, it's time to replace it.

Spikes in Monthly Bills

Dirty air filters and internal components are often the culprits. This is why it's important to keep up with maintenance. A technician will clean your furnace's internal components during a tune-up.

Inefficient Heating

If your furnace isn't old, inefficient heating is a problem you can probably fix with a repair or a tune-up. Dirty air filters restrict airflow in the furnace, so they can result in inefficient heating. Thermostat problems can also cause your furnace to fail. Your furnace may heat unevenly, fail to reach the set temperature, or fail to turn on at all. Try changing the batteries. If that doesn't work, an expert HVAC technician can diagnose your system for you.

Short Cycling

Short cycling occurs when your furnace turns on and off too frequently. An oversized furnace can cause short cycling. After giving a blast of warm air in your house, the system will shut off because its sensors detect the warm air. If you notice short cycling on a furnace that wasn’t recently installed, there’s likely a different cause. Short cycling also shortens the lifespan of your heating system, so you should have an expert technician service it.

Troublesome Noises

When your furnace makes unusual noises — squealing, rattling, banging and screeching — it's in need of repair or maintenance. One of many problems may be the cause behind an unusual sound from your furnace, but only an expert repair technician can diagnose it.

Parts inside the system may have loosened or broken. Squealing sounds usually mean that moving parts in the system have lost lubrication. During a maintenance call, expert furnace technicians lubricate these moving parts to prevent this problem.

Abnormal Smells

If you smell gas, turn off the furnace immediately. It’s best to leave your home until a technician has confirmed it's safe for you to return. Bring any pets with you too. Gas leaks are a safety risk.

A burning plastic odor or metallic smell can signal a wiring problem. You may have wires melting, which is a fire hazard. Turn your furnace off until it can be replaced.

Routine maintenance reduces the chance you'll have gas leaks or electrical problems with your furnace. Expert maintenance technicians thoroughly inspect your furnace to catch early signs of deterioration.

If you smell something burning when you have just turned on your furnace, it’s probably dust. Dust accumulates in your system while it’s not in use. When you turn your furnace on for the first time, that dust may burn. This isn’t usually a concern.

Musty odors are usually caused by mold. You should have an expert technician investigate the source of the musty smell since mold is harmful to your health.

What Our Customers are saying on Google:

  • 5 star review  I have an old water boiler heating my home, and every other company I called insisted on installing a new system. Some of these solutions were priced upwards of $15,000, or were contract based with a monthly fee of close to $200 on a 10+ year term. Sonny (the owner) came by and immediately recognized that the water pump was broken, and had Silvio (his employee) fix it the next day. Silvio also identified which parts to replace in the future, should any others break down. I can't recommend Sonny's company enough, and will be referring him in the future.

    thumb Calum MacRury
    December 29, 2022

    5 star review  We have always used City Air Toronto Heating & Air Conditioning for our 100 year old building furnace which they continue to have running. They are very knowledgeable and experienced and can repair and troubleshoot the problem quickly-- Sylvio repaired our furnace and it works like brand new.

    thumb Ferdinand Suzara
    November 23, 2022

    5 star review  Incredible service maintenance! Was on time, very quick and helpful. He did a perfect job replacing our furnace motor. Didn’t leave any mess. 5 stars!

    thumb Desire Kaniki
    November 19, 2022
  • 5 star review  Sylvio came out to relocate my AC unit. I didn’t have levelling gravel so he picked some up at a landscaping store and laid it down.l first. Came by on time and did a great job, cleaned my AC unit as well as there’s a dusty condo development happening across the street. He spoke with the neighbour and even cleaned their unit for free. Great service…he really cared about doing a good job. Above and beyond.

    thumb Andrew Moffat
    July 14, 2022

    5 star review  When our AC blew in the middle of July, these guys really saved us! They were on site within 3 hours of the initial call, and were able to give us a thorough breakdown of what our issue was. We ended up needing a whole new AC unit, and they were able to have a new unit installed within 24 hours of the initial visit. The price is super affordable given the quality of service, and the quality of the unit installed at our home! They were quick, efficient, and so kind. Any questions or concerns we had were handled with ease and guarantee. I would highly recommend this company to others who are in need of these services! Will definitely be calling them with any HVAC needs in the future.

    thumb Fiona Williams
    July 12, 2022

    5 star review  I am extremely pleased with the services they offer. They were super quick and helpful with fixing heating issue in the middle of winter when the main competitor wasn't able to help at all for several days... Now I am working with them every time I need, super reactive. Take time to explain and discuss. Good price and quality. Silvio is super nice and professional. I am so glad I found them! Totally recommend them.

    thumb Florence Mallier
    May 26, 2022
  • 5 star review  A 16 year old furnace at a rental stopped working the other day. I called City Air and they dispatched the technician. Sylvio was onsite in Newmarket quickly and reported the furnace was not worth repairing given its age and he recommended replacing it. He also mentioned he had recently purchased a dented furnace at a discount clearance and would sell it to use for $600 off discount. I approved the work and Sylvio had the replacement in and everything cleaned up early evening. He also cleaned up the gas pipe that ran from the furnace to the water heater to give us more room to move around at no charge. The next day I called him asking for a little cleanup of the expanding foam and caulking where the exhaust piping reached outside. Sylvio was back on site within an hour to do the clean-up. Very impressed with the quality of work, attention to detail, and the good price.

    thumb Steve Rush
    April 2, 2022

    5 star review  City Air was very thorough and professional with their work they did for me. Also the price was okay. I highly recommend City Air for anybody who needs a new furnace, furnace maintenance, or a new air conditioner for your home or business. They also did a great job servicing my hot water heater. And I like the fact that they put tarps down wherever they walk, so they left my house very clean.

    thumb Pat Riotic
    April 2, 2022

    5 star review  Excellent knowledge and service

    thumb Vince Puorro
    January 8, 2022
  • 5 star review  Silvio and Dominic did a great job. They always showed up when they said they would and did it all on the hottest days this summer.

    thumb Hamish Madrus
    September 15, 2021

    5 star review  My experience was amazing. I called Sunny at City Air who sent Sylvio to look at my air conditioner. Sylvio arrived and explained my different options of which I decided to purchase a replacement unit. The work went well and my home is cold. Thank you all at City Air for your help and expertise Julius from ScarboroughService: Install AC

    thumb ・Really “Z A R A H P A S T O R” peachy・
    July 15, 2021

    5 star review  The technicians were pleasant, prompt and got the job done in record time!

    thumb Jacky Bouchard
    June 29, 2021



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City Air has been serving the Greater Toronto Area  since 1989 with over 
30 years of combined experience in installing, servicing and maintaining.
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