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Air Conditioner Installation in St. Catharines

With over 45 years of experience offering air conditioning installation in St. Catharines, homeowners can trust Mr. Furnace Heating and Air Conditioning to get the job done right. With high-quality customer service, efficient appointments, and long-lasting results, our professional technicians will help you update your home and maximize your home’s energy efficiency.  

Call us directly or book a free at-home consultation online with one of our air conditioning contractors today!

Time to buy a new central air conditioning system?

Take advantage of our limited time sale and save on a new system before the weather heats up and this deal cools down.

  • Price advantage. Take up to $1,000 off a new system.
  • Good financing. On your new system.
  • Same & next day installation. No long waits: book & be cool ASAP.
  • Get the right size AC. We help you find the perfect fit for central air.
  • Longest-lasting equipment. Get a guaranteed long lifespan with our AC systems.

“Ryan, Mac and Bryan performed the install on our new AC and Furnace. They exceeded all of our expectations. We were impressed with their professionalism, cleanliness, and attention to detail. They took time to explain each step of the installation process and taught us how the new systems and thermostat work. Vince was a great salesman, he provided a thorough quote after exploring our needs and wants. Round of applause to all the Mr. Furnace staff. We highly recommend them.

Save all summer with 24 hour repairs at no extra charge.


That means round-the-clock air conditioning repair near you, with no extra or emergency fees.

Call us on weekends, holidays, or in the middle of the night: whenever you need AC service, find the local techs at Mr. Furnace and we’ll take care it – no sweat.

“My husband and I moved into a new home in 2 months later we needed a new air conditioner. Matthew was our service person and he was excellent. On time, efficient, and explained everything about our new unit. He offered to come back at any time without hesitation if we had any issues with our a/c. I highly recommend this company and especially, Matthew! 5 stars.

Get more off the cost of your air conditioning installation.

Take advantage of Mr. Furnace’s limited time sale on a new AC and bask in big savings all summer long.

Save up to $1,000 off your system and make no payments – including interest.

Absolutely fantastic service from the prompt response to my request for service, the sales associate and finally Ryan and John’s installation of my new furnace and AC unit. They were all extremely professional, prompt, courteous, respectful and knowledgeable. At no point did I feel like my concerns weren’t addressed or that my questions not answered completely. Without hesitation I would highly recommend Mr Furnace to anyone. On another note Ryan was a fantastic mentor to John. Very patient and took the time to explain and train John as a new technician. Ryan is the type of mentor we all wish we could hire to train our new employees!”

Signs it’s time for an air conditioning system replacement.

Cost savings come from knowing when it’s time to say goodbye to your current central air system.

Know the signs it’s time to upgrade. Does your system have…

  • Poor air flow/irregular temperature​?
  • A tendency to run non-stop?​
  • Bad smells?
  • Constant leaks?
  • A need for non-stop repairs?
  • You paying more than you think you should in monthly energy bills?

Then it might be time for an AC replacement.

Get up to $1,000 in cost savings on air conditioning installation from the local pros at Mr. Furnace.

Very pleased with my new furnace and air conditioner. The guys were in and out in four hours with minimal disruption. Big shout out to Anthony for being so brief in his explanations (my request because I hate long drawn out details) and for being patient with my scared rescue dog. He’s a gem.”

What Sets Mr. Furnace apart?

  • World Class Customer Service – We aren’t satisfied until you are satisfied. That is why we do everything possible to ensure that each customer receives the top notch customer service experience we are known for. Our entire team works hard to ensure that your experience goes smoothly from start to finish.
  • Niagara Local – Mr. Furnace is a locally owned and operated company and has been helping local families stay cool since 1978. From the first day we opened our doors we have remained committed to providing all of our customers with top-notch products and parts, excellent customer service, and quality craftsmanship.
  • High Quality Products & Services – We are committed to providing our customers with products they can trust and craftsmanship they can rely on so that they can enjoy their air conditioner for years to come.
  • Four Decades of Experience – We have been helping Niagara families stay cool for over forty years. When you choose Mr. Furnace, you know that you are choosing a company with a sterling reputation that always puts their customers first.


Choosing an HVAC contractor isn’t easy. Therefore, to make sure you partner with someone you can trust, here is what you should look for: 

  • Years of experience in heat and AC replacement
  • Track record of success that is proven with positive customer reviews 
  • Knowledge of which HVAC unit is suitable for your home
  • Free consultation on repairs, maintenance, and installations 
  • A warranty on all services 
  • A price for services you require before any work has been performed

Don’t know whether it’s time to replace your air conditioning system? Check for these signs around your home: 

  • Your unit is blowing warm air 
  • The thermostat is not working
  • Your unit is making odd noises 
  • There is low air pressure coming out of your air vents
  • Strange odours are coming from your AC unit 
  • Your AC unit is leaking water
  • Your monthly energy bill is high 
  • Your unit is more than 10 years old

Your required air conditioning unit size to efficiently cool your home is based on its cooling capacity measured in British Thermal Units (BTUs) and the unit’s Seasonal Energy Efficiency Ratio, which will depend on the square footage of your home. 

New air conditioning units are designed to be more energy-efficient. Therefore, if your unit is older, it will require more power to cool your home than a new unit that needs less energy to do the same job. As a result, your monthly bill will be lower, and you will save money over time. 

Our Guarantees

Whether we are installing an air conditioner or repairing your furnace, the team at Mr. Furnace stands behind our work. We aren’t satisfied until you are satisfied, and we will do everything we can to ensure that your experience with us is a great one.


No Loopholes™

We aren’t satisfied until you are 100% satisfied with our craftsmanship, products, and materials. If within two years of the date of installation, you are not completely satisfied with our service or the quality and performance of your home comfort system, and we can’t make it right for you then we will gladly remove the system and return your original investment.


No Hassles™

If your new system breaks down within the first year, leaving you without heating or cooling, we guarantee that we will repair your equipment within twenty-four hours of your call or we will fix your problem for free and give you $1,000 to apologize for the inconvenience.


Just Right™

Not too hot, not too cold… Just Right!™ If your system does not achieve the temperature you desire, we will make any modifications up to and including replacing the entire system at no charge.


We Respect You™

We promise that while our technicians are in your home, they will respect your property, protect it from damage, and leave their work area as clean as they found it. If we fail to meet any of the high standards we have set for ourselves, we will give you our full Five Year System Check-Up Package free of charge.

ENERGY STAR® for Your Home

We’re proud to offer ENERGY STAR® certified products, the gold standard for measuring energy efficiency in North America. Whether you’re looking for a furnace, air conditioner, water heater, or heat pump, all products with the ENERGY STAR® label have undergone rigorous testing for energy efficiency.

For you, this means lower emissions and a lower energy bill.

Satisfaction Guaranteed

We guarantee all of our work for one year after the date of installation.

24-Hour Service

Reliable service, whenever you need it. No additional charge for after-hours, weekend, or holiday appointments.

Decades of Experience

Mr. Furnace has been serving families in St. Catharines and the Niagara region since 1978.

Right Time™ Certified Technicians

All of our technicians undergo a thorough background check and extensive training.

Locally Based & Operated

Our customers are our neighbours – we’ve been Serving local families for over forty years.

Exceptional Customer Service

We have an average 4.5-star rating on Google, and the Better Business Bureau® has awarded us an A+ rating.

Book a Home HVAC Service with the Pros at Mr. Furnace

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What Homeowners Say About Us

From the home comfort specialist to the installers, Mr. Furnace was a pleasure to deal with and very accommodating. They went above and beyond from initial consultation to the end of installation. They committed to everything they said they would do and more. All work is certified and looks very clean and neat. They are even coming back in the spring for AC unit start up. If you need a new furnace, air conditioner, or just service I highly recommend Mr. Furnace.“​