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Heating & Air Conditioning for St. Catharines, Niagara, & Surrounding Area

Air Conditioner Repair in St. Catharines

For all your AC repair needs in St. Catharines, Ontario, Mr. Furnace Heating and Air Conditioning have got you covered. With over 45 years of professional experience, our licensed and certified air conditioning technicians can provide you with high-quality customer service and reliable repairs with long-lasting results. 

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

24 Hour Air Conditioner Repair

AC breakdowns are no sweat when you’ve got the guys in the green truck helping you save big bucks.

For a limited time this summer, Mr. Furnace is bringing St. Catharines & Niagara homeowners a sweet treat to beat the heat, with $100 off the cost of air ALL conditioning repair services near you.

Our certified AC technicians are on call 24/7/365, with NO EXTRA charge for weekends, holidays, after-hours or emergency service.

Why Choose the Pros at Mr. Furnace for AC Repair?

Mr. Furnace Heating and Air Conditioning provides homeowners with reliable, round-the-clock residential repair services for central air systems across St. Catharines, Niagara and the surrounding areas:

  • 24/7/365 residential service for air conditioner leaks, frozen AC, compressor repair, fan troubles, lack of cool air & all other central air issues
  • Emergency & last minute home appointments available
  • Certified experts with three decades of experience and G1, G2, 313A & 313D, 308A, ODP, Wardflex, and Supervisor Training Program & IHSA Health and Safety Education Program for Contractor Safety Essentials


Generally speaking, air conditioning units will last anywhere between 5 to 10 years before needing to be replaced. However, when homeowners maintain their air conditioning unit and diagnose problems before they become more severe and costly, they can extend the lifespan of their unit.

If your air conditioning unit is running but not cooling your home, it may be due to:

  • A thermostat malfunction
  • A dirty air conditioning filter
  • A clogged or frozen condenser coil
  • Leaking refrigerant
  • An improperly sized air conditioning unit for your home

There are many reasons why your air conditioning unit may not be working correctly. Whether due to its age, a dirty air filter, a thermostat malfunction, leaks, or damaged and broken mechanical components, your indoor home environment can become uncomfortable quickly when your air conditioning unit is functioning as it should. Therefore, if you’re having difficulties cooling your home, then it’s time to call the professional technicians at Mr. Furnace Heating and Air Conditioning today!

What Sets Mr. Furnace Apart

  • 24-Hour Service at NO EXTRA CHARGE – No matter what time, day or night, we are here to help. With twenty-four hour service, assistance is just a phone call away. There is no additional charge for weekend, after-hours, or holiday service.
  • Experienced Technicians – Our experienced technicians are fully accredited, so you can rest assured that your air conditioner is in good hands. After over forty years of fixing air conditioners, our team of experts can handle even the trickiest problems. Our technicians are highly trained, punctual, and efficient.
  • High-Quality Parts – To help ensure that your air conditioner keeps running smoothly, we only use high-quality parts from trusted brands.
  • Guaranteed Work – We aren’t satisfied until you are satisfied. That is why we offer a one year guarantee on all work we do. Our high standards for customer service have earned us an average 4.5-star rating on Google and an A+ rating from the Better Business Bureau.

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.

Why Choose Us?


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.

What Homeowners Say About Mr.Furnace’s HVAC Services

I have had the best quality service, maintenance and assurance of safety and performance of the furnace and humidifier unit! Matt and others have been professional and explained the issues of concern. This was a scheduled annual maintenance and some problems needed tending to proactively rather than waiting for the system to break down. I am so glad I joined the monthly program. A superb company and team!“​

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.“​