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Heating & Cooling in London and the Greater Surrounding Area

Furnace Repair Services in London 

Keep your family warm and comfortable throughout the year with professional furnace repair services in London, Ontario. With over 35 years of experience, the certified HVAC technicians are M&K Heating and Air Conditioning has the skills and expertise to provide homeowners with high-quality solutions they can rely on. Whether repairs, maintenance, or new installations, homeowners can rest assured knowing we have their best interests in mind. 

At M&K Heating and Air Conditioning, we are pleased to offer 24/7/365 service and no extra charge for after-hours, emergencies, weekends, or holidays! We can also provide you with same-day or next-day installations in the event that you have an HVAC problem that needs to be installed as soon as possible! Call us directly or book an appointment with M&K Heating and Air Conditioning online today!

24 hour home furnace repair in London & surrounding areas.

M&K Heating and Air Conditioning provides homeowners with reliable, round-the-clock residential repair services for central home heating systems across London and the surrounding areas:

  • 24/7/365 residential service for furnace issues such as problems with heat pumps, pilot lights or ignition, clogged filters, lack of airflow, leaky ducts, mould, inaccurate thermostat, and more
  • Emergency & last minute home appointments available
  • Certified experts with four 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, homeowners will want to have their furnace maintenance at least once a year. Preferably, we recommend homeowners book an appointment with us in the early fall before the temperature begins to drop. By doing so, homeowners can make sure that their furnace is prepared to work as efficiently as possible during the colder months when they are more likely to rely on their HVAC unit to heat their home. In addition, booking a yearly maintenance appointment in the early fall will provide enough time for any repairs or replacements to be conducted before the temperature drops in the event that your certified HVAC technician discovers any issues during your maintenance appointment. 

Are you overdue for maintenance on your HVAC unit? If so, book an appointment with M&K Heating and Air Conditioning today!

Most of the time, when there is something wrong with your HVAC system, you will be able to tell. However, not all of the signs are as noticeable as others. Therefore, here is a list of some of the signs that you can look out for around your home that may indicate that it’s time to call a professional HVAC technician to your home: 

  • There are strange noises coming from your furnace every time you turn it on. 
  • You notice odd odours coming from your furnace. 
  • You are finding it challenging to keep your home warm throughout the winter. 
  • You have noticed a significant increase in your home’s monthly energy bill. 
  • Your thermostat reading is inaccurate to the temperature you are experiencing in your home. 
  • Your furnace will turn on and off at random, unexplained times. 
  • Your furnace will not turn on at all. 
  • You and your family are experiencing unexplained allergies or cold-like symptoms that have extended for a long period of time. 
  • There is mould and mildew growing in or around your furnace. 

Diagnosing and repairing your furnace system before problems turn into more costly repairs is key to ensuring that you are not left paying for damages that could have otherwise been prevented. By maintaining your furnace at least once a year, homeowners can rest assured knowing that their furnace is functioning optimally as possible and that all mechanical, electrical, and other components of their HVAC system are up to date and working. 

Have you noticed any of the above-noted signs around your home? If the answer is yes, then it’s time to book an appointment with the professional and certified HVAC team at M&K Heating and Air Conditioning for assistance.

At M&K Heating and Air Conditioning, we strive to ensure that our HVAC services are thorough, efficient, and high-quality so homeowners can get back to enjoying the comforts of their homes in no time. When homeowners in London, Ontario, book a furnace repair service with our certified HVAC technicians, they can expect the following: 

  • Evaluating temperature settings on your furnace 
  • Check your thermostat to ensure accuracy 
  • Inspecting for any gas leaks (if applicable) 
  • Analysis of your vent connector
  • Inspection of your venting system 
  • Lubrication of your blower and motor mechanics 
  • Assessing the function of your furnace’s safety limit controls
  • Cleaning and inspecting the blower 
  • Assessment of the vent blower and pressure switches (if applicable)
  • Inspection of your furnace’s burners
  • Thorough cleaning of your furnace’s burners 
  • Examination of the heat exchanger to ensure there is no damage 
  • Testing your blower speed and function
  • Cleaning of your furnace air filter 
  • Measurement of the gas piping to the furnace
  • Inspection of all electrical components attached to your furnace 
  • Assessment of individual parts to ensure there is no wear and tear 

When damage to your thermostat goes unrepaired, it can end up costing you more money in the long run. Therefore, it is crucial that homeowners in London, Ontario, call a professional HVAC technician to their home as soon as they believe something is wrong. By doing so, you can have the problem repaired quickly by one of our certified technicians in no time. 

M&K Heating and Air Conditioning are happy to off 24/7/365 service and no extra charge for after-hours, emergencies, weekends, or holidays! Call us or book an appointment with us online today!

With over 35 years of experience working in the HVAC industry, M&K Heating and Air Conditioning have had the opportunity to work with thousands of homeowners and furnaces. Therefore, when it comes to furnace repairs, we’ve truly seen it all! Here are some of the most common furnace repairs we have experienced throughout our time in business: 

  • Thermostat malfunctions: Low batteries, inconsistent temperature readings, or setting malfunctions.
  • Dirty and clogged filters: Clogged, dirty filters can lead to a reduction in your home’s energy efficiency, can lower your indoor air quality, and lead to health concerns.
  • Pilot light malfunctions: Flickering pilot lights, weak pilot lights, and strange color pilot lights can all indicate increased amounts of carbon monoxide in your furnace if it is powered by gas.
  • Damaged heat exchanger: Your heat exchanger is responsible for heating the cooled air before it is pushed back into your home. When this is damaged, you will be unable to properly heat your home.
  • Loose or damaged parts: Loose mechanical parts or damaged mechanical parts are often indicated by strange noises that come from your furnace when it is operating.
  • The furnace does not blow out air: This is often caused by built-up debris that has clogged your blower. When this happens, you will be unable to properly heat your home.
  • Wear and tear of blower belt: When the blower belt malfunctions, you will notice that your furnace may make weird noises as it operates, which can lead to a decrease in energy efficiency.

Is your furnace not heating? If the answer is yes, then there are many reasons why this may be happening. One of the most common causes of your furnace being unable to heat your home is a dirty or clogged air filter. When this filter collects too much dirt, dust, hair, and other debris, it can significantly decrease your furnace’s airflow. When this occurs, your heat exchanger will often overheat and shut down before it has actually heated your home to your preferred temperatures. As a result, although your furnace has shut off, your home will still be cold. On the other hand, you may have a problem with your thermostat. Typically, when your thermostat malfunctions, it provides different temperature settings. When these are inaccurate, it can affect the heating cycle you have programmed. 

If you are experiencing difficulties with your furnace, then it’s time to call the professional HVAC team at M&K Heating and Air Conditioning for assistance. We’ll send someone to your house as soon as possible to take a look and repair the problem in no time so you can get back to your daily routine. 

What Sets Us Apart

  • Satisfaction Guaranteed – All of our technicians are expertly trained so they can offer you efficient service and repairs you know you can trust. We aren’t satisfied until you’re satisfied, so we will make sure your repairs are done Just RightTM the first time.
  • Gold Star Ratings – At M&K, we take our work very seriously, and that is reflected in our 5-star Google rating. We want to make sure that your furnace is operating as it should and that any repairs are done quickly, efficiently, and correctly. That’s why make sure that no matter what, there are No HasslesTM when you entrust your furnace repairs to us!
  • Over 3 Decades of Experience – M&K has been servicing the London, St. Thomas, & Mount Brydges areas for over 30 years. We’ve seen it all, and we are confident in our ability to diagnose problems and offer solutions. Our team has been able to learn a lot during this time, which means we can provide service backed by tried and true experience.
  • Customer Service Champions – We know how it feels to invite a stranger into your home, so we make sure to treat you and your home with the courtesy you’d expect from a We Respect YouTM guarantee. We promise to be polite and punctual and clean up after ourselves when we are done working.

Our Guarantees

We have the utmost confidence in our work and our people and want to make sure you do, too. That’s why we offer a 2-year guarantee to repair, replace, or refund. Whatever you need until you’re 100% satisfied.

Why Choose Us?


No Loopholes™

Up to 2 years after the installation date we ensure 100% satisfaction or your money back. No LoopholesTM, no problems.


No Hassles™

If your new furnace breaks down within the first 2 years of installment, we’ll fix it for free within 24 hours or give you $1000 for your troubles. No HassleTM, no headache.


Just Right™

We guarantee that any furnace we install will keep you comfortable. If your system isn’t providing a consistent temperature anywhere within 5 years of the installation date, we’ll fix it up to and including replacing the entire system, totally free. No fluctuations, Just RightTM.


We Respect You™

We pride ourselves on always acting with integrity and promise to treat your home with the utmost care and respect. If we don’t meet your expectations in any way, you’ll receive our Five Year System Check-Up PackageTM totally free of charge. We Respect YouTM and your home.

Guaranteed Comfort

We aren’t satisfied until you’re satisfied, guaranteed.

Always Ready

We are always available, 24/7 365 for any HVAC emergency you might have.

Trusted Experience

We have been operating since 1983, which means we have over 35 years of expertise to offer.

Technological Expertise

All of our technicians are Right TimeTM certified and continuously trained to maintain excellence.

Locally Based & Operated

We operate in the London area and have been for over 3 decades, which means we’ve gotten to know our neighbours.

Exceptional Reviews

We maintain a 5-star rating on Google for a reason; we care about our work.

Book a Home HVAC Service with the Pros at M&K Heating and Air Conditioning

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What Homeowners Say About Us

“I recently had an Air Conditioner and Furnace installed by M&K. I called around and talked with several companies, they have the best warranty and were the most knowledgeable when it came to answering my questions. Everything was installed perfectly and up to code in a timely manner. Very happy with the system and service!“​