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CM Expert

Fast Air Conditioner Repair in Mississauga

Don’t suffer through another hot day. Our local AC repair technicians can diagnose and fix your air conditioning problems quickly and efficiently, so you can get back to enjoying cool comfort.


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Same-Day Service

Our technicians are fully committed to arriving at your home quickly and resolving any problems efficiently.

Advanced Diagnostics

We don't just fix the problem, we prevent it from coming back. Our experts use best tools to pinpoint the exact cause.

Service Warranty

We back our repairs with a 1-year warranty, so you can be confident your AC will keep you cool all season long.

Cost Upfront

We believe in transparency. That's why you'll receive a clear and detailed quote outlining the repair cost before any work begins.

Prompt Response & Expert Solutions

Our skilled technicians are available today to diagnose and fix your AC problems quickly and efficiently.

HVAC Champions

Our technicians aren't just skilled, they're champions of HVAC services

Why Choose CM Expert FOR HVAC Services in Mississauga


Positive reviews on:
Experienced Technicians

Our technicians have acquired extensive expertise that enables prompt solution-finding. They continuously enhance their skills through ongoing manufacturer certifications and industry courses to stay up-to-date on the latest technologies and repair methods.

Fast and Reliable Service:

Here at CM Expert, you can depend on prompt arrival and efficient service every time you contact us for an HVAC repair.  Our technicians take the needed time for thorough diagnosis and procedures to ensure long-lasting fixes.

Affordable Rates:

We strive to make premium AC repair accessible for both commercial and residential clients through affordable pricing. We aim to provide honest assessments along with transparent quotes upfront so there are no hidden charges.


What Our Clients Are Saying about us

Our HVAC Company Reviews

Certified Mechanical

4.5Out of 5 stars

Overall rating out of 151 Google reviews

Amazing! Professional and quick service!

Fleming Viegas
3 weeks ago

a great job done on time

Brian Edwards
3 weeks ago

Great service and helpful technician.

David Duncan
3 weeks ago

Very reliable

Raul was very personable and professional. He called in advance to confirm and came back as promised the next day to fix our dryer after his initial diagnosis.

Jason Chan
2 months ago

Price was the highest of all contractors I asked for a quote from. Not at all competitive with other companies for the same product and service. Definitely recommend getting multiple quotes from different contractors before selecting a company. Edit: to answer below, the reason for one star is because the job was not to repair something. It was to replace. All the other contractors were quoting for the same replacement. The actual price will not be lower than your quote will it? Price gouging is not a good business model

Opulent Kitchen
2 months ago

Technician was very helpful and gave all the options to best help me

Mark McDonald
2 months ago

Had a great experience with the technician that came to my laundromat. Very hard working and professional and went out of his way to deliver amazing service for me. Ronaldo is great. Thanks guys. Will definitely use them again.

Sol Omon
2 years ago

Our washing machine was rattling and making a lot of noice so we did a google search for repair service. We found out during this search that Certified Mechanical has the designation of Google Guarantee which means (Businesses with the 'Google guaranteed' badge are screened, and are guaranteed to get the job done right or your money back with a lifetime cap of $2,000. ) Anthony the owner of the establishment sent a repair technician and the charged us for $99 to see visit out place and diagnose the problem. The repair was going to be costly so we decided to purchase a new washer and dryer. We called Anthony to provide us with quotes of 3 brands and see which one was in stock and we decided to proceed with the brand that was available and in stock. (This was not our 1st choice but we had did not want to wait 2 weeks plus) We understand the supply chain issues and low inventory and wanted the delivery and install to be done within 3 days. The only thing that I would say is that Certified Mechanical had to outsource the installation of the machines to another trade but we are happy with Certified Mechanical that the trades assigned to install the machines did a good job. Thank you Google for screening the vendors as it sure helps in make a decision and thank you for the $2000 guarantee.

Amory Erheim
3 years ago

I own a triplex home in Toronto that I rent. Anthony visits the property annually to inspect the system. My experience he is honest, don’t pull your leg or wallet, he is professional & don’t waste your time. Proficient & knows his trade.

Emilio Farouse
9 months ago

Ronnie's definitely a magician, in the best way possible. I work in the property management field and had an issue with a high end commercial dishwasher. Ronnie was on time, professional and informative. He was able to not only fix our machine but leave it functioning better than it was pre breakdown. Keep guys like this around, your sanity and your wallet will thank you.

Ella Lightstone
5 months ago

Our Mechanic showed up on time, patiently explained the issues. fixed it quickly, and even helped move things back into place. Kind and thorough, went above and beyond!

Anita Kumari
8 months ago

Mr Omari went over and above helping me fix my fridge. He was helpful and provided amazing guidance and advice for an easy fix on my fridge. It's hard finding honest and knowledgeable repair people. Thank you again!

Leila Aquino
a year ago

I called Certified Mechanical and they sent Anthony to fix our broken furnace. It was too cold and we can't sleep. Thanks to Certified Mechanical, they repair our furnace right away. Anthony is really knowledgeable, and reliable. Sincere and explains the necessary work. Highly recommended!!!!

Tana Turner
2 months ago

Thank you for your excellent service as always. Ronnie is so knowledgeable and good to work with. Always a pleasure!

2 years ago

Absolutely happy with the service that was provided. It was professional, quick, and honest. Anthony was able to come and access the problem with my fridge and was able to fix it within 15 min. Whoever requires any kind of repair, Anthony and his company is the company you need to contact. Unfortunately I previously had hired another company and they simply scammed me and didn't fix anything. Disappointed that I didn't find Anthony sooner. I would give more than 5 stars if I could.

Michelle Jamieson
6 months ago

Responsive, professional service. Anthony did a great job on our beverage fridge repair.

Melanie Minshull
2 years ago

Raul was Amazing!! He was able to identify the problem easily and then let me know the plan to correct. He was on time and communicated everything clearly. The repair was completed and saved me replacing the dryer!!! I will definitely be calling back if I ever need help again.

Our Comprehensive AC Repair Services

We understand that cooling systems require proper upkeep and maintenance to function at their full potential throughout the hot summer months. That is why our comprehensive ac repair services include inspection, cleaning, replacement of filters, lubrication of parts and more to help keep your air conditioner running cleanly, efficiently and reliably for many more seasons of temperature regulation and comfort.

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We Will Deal With All Your AC Issues

Our experts can fix any air conditioner problems


Mississauga Reliable Air Conditioner Repair

Our cooling technicians are highly trained professionals who understand the value of your time. When your air conditioner stops working effectively, you don’t want to wait days or even weeks to get it repaired. That’s why we strive to make the ac repair process in Mississauga fast and efficient so you aren’t left waiting in the heat. Our team has all the expertise and tools needed for any ac repair to get your cooling system functioning properly again as quickly as possible.

air conditioner repair Oakville
Mississauga and searching for “AC Repairs near me”?
As one of the largest cities in Canada with over 800,000 residents, Mississauga experiences hot and humid summers typical of the Golden Horseshoe area. With climate change also extending warm seasons, reliable air conditioning is an important consideration for homeowners and businesses alike across Mississauga. We are serving the entire city, with decades of experience keeping local AC units functioning properly through this popular municipality.
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We Cover all of the Greater Toronto Area

Emergency AC Repair

There is nothing more stressful than experiencing an unexpected problem with your air conditioner unit during the heat of summer. When your system ceases to function properly and you need fast cooling relief, our emergency AC repair technicians at CM Expert are standing by to respond as quickly as possible. We understand the urgency of these situations, which is why you can count on us to arrive at your door prepared with the skills and tools for diagnosing and addressing a wide variety of air conditioner issues.

AC Unit Repairs & Maintenance

We stay up-to-date on the latest techniques for thorough AC unit repair services that extend the life of your air conditioning system. Through consistent maintenance checks, filter replacements, refrigerant adjustments and more, we can catch small issues before they become expensive problems. Our services include comprehensive inspections to evaluate all components for maximum performance.

AC Compressor Repair Services

The AC compressor is the heart of your air conditioning system, and a broken or failing compressor is a problem that needs prompt attention to restore cool comfort. As one of the leading providers of HVAC repair in Mississauga, we have extensive experience servicing and repairing all compressor issues competently and cost-effectively. 

Whether a compressor simply requires replacement capacitors or valves or must be completely overhauled, our factory-certified technicians have the technical competence to thoroughly evaluate the issue and determine the best solution.

AC Repair in Oakville

Fixing refrigerant leaks

One of the most common issues that can compromise the productivity of a cooling system is the presence of refrigerant leaks. Over time, small cracks or breaks can develop where refrigerant can seep out, leading to inefficient operation and potential breakdown. We understand the importance of maintaining optimal refrigerant levels and fixing leaks promptly to preserve both the performance and lifespan of your air conditioning unit. Rely on us to get those cooling chemicals circulating properly again throughout your essential AC system.

Find out more about our services in Mississauga

In addition to furnace, and air conditioner repair and installation, we also offer comprehensive repair services for walk-in coolers and commercial dishwashers. Whether a piece of equipment is used for cooling food products or efficiently cleaning dishes on a large scale, our team has the experience and qualifications to evaluate unique commercial appliance issues. We strive to provide convenient service for all your repair needs within the Mississauga area.

We will repair all your AC Issues

.Whether your air conditioner needs a simple fix or a complete system overhaul, we can handle any air conditioner repair Mississauga homeowners and businesses require. As a full-service provider serving the area for many years, we have repaired and maintained units from all major brands. Our team is authorized to work on most models, so you can count on properly certified technicians seeing to your specific equipment needs thoroughly.

Weak airflow

A common air conditioning complaint many homeowners face is weak, limited airflow from their vents despite the system running. There are several potential causes our skilled HVAC technicians regularly encounter and are well-equipped to handle. Dirty air filters in need of replacement are usually the primary culprit, restricting circulation. Fan issues inside the unit can also impair airflow. 

Our team will thoroughly inspect the evaporator coil, blower fan motor and housing, as well as ductwork for any obstructions inhibiting proper ventilation. Whether a simple filter change or more involved motor repair is necessary, you can count on us to diagnose the root of weak airflow problems efficiently and restore strong, robust cooling throughout your space.

Electrical Problems

A malfunctioning circuit board, loose wires or defective thermostat are all electrical problems we frequently encounter during service calls here in Mississauga. Similar to diagnosing any mechanical issue accurately, we employ a systematic testing process to pinpoint troubles in the electrical control components. Qualified personnel comprehensively evaluate voltages, start relays, motors and more to safely determine failing parts. 

Whether a simple replacement of a fuse, capacitor or thermostat solves the issue or a circuit board must be repaired, you can rely on our team’s electrical certifications and years of experience to ensure your unit’s electrical problems are properly fixed right the first time. Robust, professional electrical troubleshooting is key to restoring efficient AC performance

Thermostat Issues

As the control hub for the entire air conditioning system, a faulty or problematic thermostat can wreak havoc on your cooling ability and comfort levels. Our technicians at CM Expert are amply prepared to diagnose and correct any thermostat issues through meticulous testing. Whether your programmable thermostat has lost programming, a manual thermostat fails to switch between heating and cooling modes as needed, or you are experiencing inaccurate temperature readings. 

Our team can pinpoint the problem and return the thermostat to proper working order. We carry a wide inventory of replacement OEM thermostats as well as universal fit models for rapid repairs or installs in any brand unit. You can rely on us to thoroughly examine your thermostat problems and provide a quality solution that restores cooling control and function.

Clogged drain lines

When excess condensation produced by your air conditioner can no longer drain away properly due to clogged or obstructed lines, it can wreak havoc on both the AC system components and the indoor environment. Our team is experienced at tracking down drainage issues, whether stemming from built-up mineral deposits internally or blocked exterior lines. 

Using specialized tools, they precisely diagnose the root cause and professionally unclog any drainage components from the evaporator coil. Should replacement or repairs be needed, you can rely on our expertise and high standards. We understand proper condensate drainage is essential for efficient and durable AC operation. Leave your clogged drain line problems to us for examination, cleaning and restoration of ideal drainage flow.

How much does it cost to repair an air conditioner in Mississauga?

The cost to repair an air conditioner unit in Mississauga will depend on several key factors that must be assessed on an individual case basis.

The specific components requiring service or replacement play a large role. For example, whether the issue stems from a relatively inexpensive part like a capacitor, thermostat or air filter, or necessitates the maintenance of larger internal machinery like the compressor, fan motor or coils could impact the price.

Repairs on units with higher tonnage that indicate larger sizes equally affect cost. Additionally, accessibility and age of the system must be considered – more complex repairs may be needed for harder-to-reach areas or older equipment. 

Our trained technicians perform thorough evaluations to determine root causes and recommend customized solutions. Only after a full diagnosis can we provide an accurate estimate factoring in all relevant details particular to your situation


One of the most common issues we see with air conditioners in Mississauga is that they will run but fail to cool properly. There are a few potential causes for this:


  • Dirty or clogged air filter: A dirty air filter restricts airflow and makes the AC work harder. This is the first thing we check when a unit is running but not cooling. Be sure to change your filter monthly during peak use.
  • Refrigerant leak: Over time, refrigerant can leak from your AC system. With low refrigerant, it can’t cool efficiently. We perform leak detection and refrigerant services if needed.
  • Evaporator coil issue: The evaporator coil inside your furnace or air handler needs to be cold for cooling to occur. It may need cleaning or repair.
  • Low-pressure switch problem: This safety switch can trip if refrigerant is low, restricting cooling. We check this switch during our diagnostics.
  • Capacitor failure: The capacitor helps the compressor start. If failed, it prevents proper cooling even if running. We replace capacitors as a standard repair.


If you notice your AC running but the temperature inside not dropping, it’s best not to continue running it. Give us a call for a full AC inspection and diagnosis to find the cause fast. Preventing further damage is important.

Whether repairing an air conditioner is worth it depends on several factors that we consider during our AC inspection and assessment in Mississauga. Some things that influence our recommendation include:


  • Age of the unit: Older AC systems that are 10+ years old may not be economically viable to repair if parts are difficult to source. We can advise if the replacement would be better.
  • Nature of the repairs needed: Minor repairs like a capacitor or thermostat replacement are usually worthwhile. Major repairs or a compressor replacement may cross the cost threshold for replacement.
  • Efficiency of the unit: Newer high-efficiency systems are often worth repairing if the issue is small. Older standard units may not recoup repair costs in energy savings.
  • Warranty status: Some manufacturers offer extended warranties that cover certain repairs, making it a smarter financial decision.
  • Ductwork and electrical compatibility: If other system components need upgrades, it may be best to replace the whole unit.


We perform a thorough AC inspection to determine the root cause and provide an honest assessment. Our goal is to help you choose the most practical solution for your budget and needs – whether that’s repair or replacement.

While it can be tempting to try to fix your air conditioner yourself, I’d suggest calling in a professional for any AC repairs in Mississauga. Here are a few reasons why:


  • Safety: Working with high voltages and refrigerants requires specialized training and certifications. You could risk electric shock or refrigerant exposure if not careful.


  • Diagnosis: It can be difficult to properly diagnose the root cause of issues without the right testing equipment. You may replace parts unnecessarily or miss the real problem.


  • Warranty concerns: Most manufacturer warranties will be void if non-certified technicians perform repairs. You want repairs covered under warranty if possible.


  • Improper repair: Without the right tools, parts, and technical know-how, your DIY repair may not actually fix the problem or could make it worse over time.


  • Cost of parts: You’ll want to be sure any parts purchased are correct for your specific AC unit and installation. A pro can help source these accurately.


  • Efficiency & code compliance: Professional repairs ensure your AC meets energy and safety standards, extending its lifespan and performance.

Here are some of the most common problems our technicians encounter with air conditioners in Mississauga:


  • Refrigerant leak – Over time, the refrigerant inside the AC system escapes. Without proper refrigerant levels, the unit can’t cool efficiently. This is a major issue we address.
  • Capacitor failure – The capacitor helps the compressor start and run. If it fails, the compressor may not turn on or cooling is diminished. We usually replace capacitors as a standard repair.
  • Evaporator coil freeze – Frost or ice buildup on the indoor coil prevents it from properly absorbing heat from inside air. This is often due to low refrigerant.
  • Dirty air filter – A clogged filter restricts airflow and puts strain on the system. We recommend changing it monthly during peak use.
  • Broken or worn components – Moving parts like fans, belts and compressors gradually deteriorate. We inspect for replacements during maintenance checks.
  • Thermostat problems – If the thermostat isn’t communicating temperature changes correctly, cooling won’t activate as needed.

Here are some important things to check if your AC isn’t working properly:


  • Thermostat settings – Ensure your thermostat is set to “cool” and the desired temperature is lower than the current room temperature.
  • Breaker/fuse – Check if the circuit breaker is tripped or a fuse needs replacing at your electrical panel. We can inspect this.
  • Air filter – A dirty filter restricts airflow and makes the unit work harder. Replace it if dirty.
  • Outdoor unit – Look for any obstructions or overgrown plants blocking air intake and outtake vents. Clear the area.
  • Refrigerant level – Low refrigerant prevents proper cooling. This requires professional diagnosis with specialized gauges.
  • Thermostat wires – Loose or disconnected wires at the unit or wall can cause issues. We perform a full wiring inspection.
  • Capacitor – A failed or worn capacitor is a common problem that inhibits the compressor.
  • Ductwork – Ensure ducts aren’t blocked or leaking, restricting proper airflow throughout your home.


For any problems beyond these basic checks, it’s best to schedule an appointment with us. Our technicians are AC experts who can properly diagnose and resolve any issues. Don’t take chances with a non-functional air conditioner in Mississauga’s hot weather.

Here are some signs that your AC may need to have its refrigerant (freon) level checked or recharged:


  • Inconsistent cooling – The unit may work fine some hours and struggle to cool at other times. Low freon causes intermittent performance issues.


  • Higher operating costs – With low freon, the compressor has to work harder to cool your home. This increases hydroelectric bills.


  • Ice buildup on lines/vents – Extra frost or ice forming indicates the AC isn’t efficiently dehydrating and cooling the air due to low system pressures.


  • Longer cooling times – On warm days, it may take much longer than usual for the unit to lower the temperature in your home.


  • Strange smells – A faint burning or metallic odor during operation could mean contaminants are entering due to a leak.


  • Unusual noises – Low freon causes the compressor to strain, which may produce new buzzing or knocking sounds.


Our technicians use specialized gauges and tools to properly diagnose refrigerant levels during a full AC inspection. If we detect low freon pressures, a recharge is necessary to restore optimal performance. Catching issues early prevents further damage.

The lifespan of an air conditioner can vary depending on the brand, quality of equipment, and maintenance practices, but on average homeowners can expect:


  • Central air conditioning units: 15-20 years with regular maintenance and repairs. High-efficiency systems may last longer.
  • Window air conditioners: 8-12 years of use, though heavy-duty models can go longer. Lighter personal units have shorter lifespans.
  • Ductless/mini-split systems: 15-20 years before needing replacement. Newer inverter-driven models are extremely durable.


Proper maintenance like annual tune-ups, cleaning and repairs is key to getting the most years out of your Mississauga AC system. 

Other factors influencing lifespan include:

  • Climate – Very hot or cold areas are harsher on equipment.
  • Usage – Season-round use reduces the lifespan versus occasional cooling.
  • Installation quality – Proper installation extends the life of any AC system.


While no unit lasts forever, you can typically get over a decade of service with regular maintenance from an experienced company like CM Expert. We strive to repair units for as long as it makes financial sense.

Here are the key factors we consider at CM Expert when advising a customer on whether it’s better to repair or replace their air conditioner in Mississauga:


  • Age of the unit – Older systems over 12-15 years often make more economic sense to replace. Parts availability decreases with time.


  • Repair costs – If a compressor or other major component has failed, the repair bill may exceed 50% of replacement. Not worth it at that point.


  • Efficiency of the unit – Newer high-efficiency models are often more cost-effective to repair due to energy savings over time. Older standard units may not recoup repair expenses.


  • Warranty coverage – Some repairs like compressors are covered by extended warranties, making repair the smarter financial choice. Warranties don’t transfer to new owners.


  • Ductwork compatibility – New units may require duct upgrades adding to cost. If ducts need replacing anyway, it’s best to do unit replacement at the same time.


  • Future-proofing needs – Larger capacity units, WiFi thermostats or other upgrades may be worth considering with replacement.
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