Last summer, during the August heat wave, your central air conditioner broke down one Tuesday afternoon. It was 33°C outside and 29°C in your living room. The kids were cranky, you couldn’t sleep, and all the technicians were swamped.
The earliest available appointment? In five days. The cost of the emergency repair? 1,200$ plus parts.
This happens to hundreds of Montreal families every summer. In August 2025, *Le Journal de Montréal* reported a 25% increase in air conditioning breakdowns compared to the previous summer.
Most of these breakdowns could have been prevented with a simple annual preventive maintenance check costing between 150$ and 300$.
In Quebec, 68% of households are now equipped with air conditioning, according to Hydro-Québec. In Montreal, that figure rises to 75% with the growing adoption of central air conditioning systems. Installations increased by 20% in 2025 alone, driven by increasingly hot and humid summers.
This guide explains exactly how to maintain your central heating system to save money, prevent breakdowns during the hottest part of the year, and extend the life of your equipment.
Has it been a year since your air conditioner was checked? Schedule a free inspection with Vortex Air before the next heat wave. by calling 514-214-7492.
Why Maintain Your Central Air Conditioning System in Montreal
A well-maintained central air conditioning system It uses less energy, lasts longer, and keeps your home comfortable all summer long. But neglecting maintenance can be costly in many ways.
Montreal's climate makes maintenance even more important. Our cold winters, followed by hot and humid summers, create challenging conditions for air conditioning systems.
Neglected maintenance is costly and leads to higher energy consumption
A dirty or poorly maintained air conditioning system consumes up to 20% more energy, according to data published by CAA-Québec in 2025.
For an average Montreal family that spends about 800$ to 1,200$ on air conditioning during the summer, that amounts to between 160$ and 240$ wasted each year. Over the lifespan of a system (12 to 15 years), that amounts to 2,000$ to 3,600$ thrown out the window.
Dirty filters force the system to work harder to circulate air. The compressor runs longer. Clogged coils reduce heat transfer efficiency. The unit consumes more electricity to produce less cooling.
In contrast, regular maintenance reduces energy consumption by 15% to 25%. AirGreen published a case study in 2025 focusing on customers in the Plateau-Mont-Royal neighborhood. After a comprehensive maintenance check, their Hydro-Québec bills decreased by an average of 25% during the summer months.
The money saved on electricity bills more than covers the annual maintenance cost in just two or three years.
Preventive maintenance helps avoid breakdowns during heat waves
Do you know when air conditioning systems break down? Always on the hottest days of summer, when you need them the most.
Daikin Québec estimates that 70% of air conditioning breakdowns are directly linked to a lack of preventive maintenance. Clogged filters, dirty coils, low refrigerant levels, loose electrical connections—all of these problems develop slowly but can lead to sudden breakdowns.
The summer of 2025 was particularly telling in Montreal. During the August heat waves, air conditioning companies received 25% more emergency calls than in 2024. Response times increased from 24–48 hours to 4–7 days during peak periods.
A power outage during a heat wave isn't just an inconvenience. For the elderly, young children, and those with health issues, it's a real danger. The emotional and physical stress of sleeping in a house at 28°C for several nights takes a toll on the whole family.
Emergency repairs are also much more expensive. Technicians charge emergency fees, parts are harder to get quickly, and you have no bargaining power when you're sweltering in the heat.
A preventive maintenance check in the spring identifies and corrects these problems before they cause a breakdown. You can rest easy all summer long.
Maintenance extends the system's service life
A central air conditioning system is a major investment. It costs between 5,000$ and 12,000$ for a complete installation in a typical Montreal home.
You want to maximize your return on investment. The difference between a system that lasts 10 years and one that lasts 15 years often comes down to the quality of maintenance.
Daikin released data in 2025 showing that regular coil cleaning extends the system's lifespan by approximately 20%. This can translate to an additional 3 to 4 years of service.
Maintenance also helps preserve the refrigerant. Slow refrigerant leaks often go unnoticed for years. The system performs increasingly poorly, but you don’t know why. By the time you realize there’s a problem, the compressor has already been damaged by a lack of lubricant carried by the refrigerant.
Corrosion is another silent enemy. Coils and metal connections gradually corrode due to moisture and contaminants in the air. In Montreal, where salt is used on the roads during the winter, corrosion can be particularly severe if you live near a busy street.
The Quebec Building Code, Chapter I, Section 6.3, stipulates that air conditioning systems must be maintained regularly to ensure their performance and safety.
Avoid unexpected breakdowns: Preventive maintenance costs four times less than an emergency repair. Contact Vortex Air today.
How often should a central heating system be maintained in Montreal?
The frequency Maintenance of a Central Air Conditioning System in Montreal depends on several factors: your type of home, how you use it, and the specific characteristics of Montreal's climate.
Official recommendations provide a solid foundation, but your specific situation may require adjustments.
Official and Practical Recommendations
Manufacturers and trade associations such as the CMMTQ recommend a complete professional maintenance check once or twice a year.
Ideally, maintenance should be performed in the spring (April–May) before the air-conditioning season begins, and again in the fall (September–October) before winter. This twice-yearly approach is particularly suitable for systems that also function as heat pumps for heating.
If you only have central air conditioning (no heating), an annual maintenance check in the spring is usually sufficient.
Between job interviews, you should do a few basic checks:
- Check and clean the filters every three months (or monthly if you have pets or allergies)
- Visually inspect the outdoor unit to remove leaves, debris, or obstructions
- Make sure nothing is blocking the air return and exhaust vents inside
Quebec Government Decree 991-2025 now requires condominium associations to maintain a maintenance log for common HVAC systems. Although this is not mandatory for single-family homes, keeping a maintenance log is a best practice that increases resale value.
Factors Specific to Montreal
Our climate makes certain aspects of maintenance more critical.
Montreal winters subject outdoor units to harsh conditions. Repeated freezing and thawing create condensation that promotes corrosion. Road salt carried by the wind can accelerate this process if you live near a major thoroughfare.
In the spring, always inspect the outdoor unit after snow removal. Ice buildup may have damaged the condenser fins or the electrical connections.
Summers in Montreal are hot but also very humid. This humidity creates the perfect environment for biofilm (a biological film) and bacteria to grow on the coils and in the condensate pans.
If you notice a musty odor when your air conditioner is running, it's likely caused by mold growing inside the system. A professional cleaning with an antibacterial treatment will solve the problem.
Older buildings in the Plateau, Rosemont, or Ahuntsic often have narrow air ducts designed for hot-water heating. When central air conditioning is added, these ducts restrict airflow. The system has to work harder, gets clogged more quickly, and requires more frequent maintenance.
In the suburbs, especially in new development areas such as Laval or Brossard, there is more construction dust and pollen in the air. Filters get dirty faster and need to be replaced more often.
Grants and Financial Incentives
Maintaining your system may make you eligible for substantial financial assistance.
Hydro-Québec’s LogisVert program offers between 500$ and 1,500$ for certain improvements to air conditioning and HVAC systems. To be eligible, you must often prove that the system is well maintained.
Hydro-Québec tightened this requirement in 2025. Grant applications must now include proof of annual maintenance performed by a certified technician for the past three years.
The Rénoclimat program also offers incentives when you combine multiple energy-efficient upgrades. A new, energy-efficient air conditioning system paired with insulation and an air exchanger can generate more than 10,000$ in combined aid.
The trick? Plan your projects strategically. If you’re planning to replace your old system in the next few years, start documenting its maintenance now. That way, you’ll maximize your grants when the time comes.
You could receive up to 1,500$ in grants with a Vortex Air-certified service. Call us at 514-214-7492 to find out how to take advantage of this offer.
How to Maintain Your Central System (Step by Step)
You can perform basic maintenance yourself to save money. However, certain steps absolutely require a professional for safety and efficiency reasons.
Here is the complete process, explaining what you can do yourself and what requires a certified technician.
Step 1 – Check and replace the air filter
This is the most important maintenance task you can do yourself. The filter protects the entire system from dust and contaminants.
Most residential systems in Montreal use filters rated MERV 8 through MERV 13. The higher the number, the more fine particles the filter captures. A MERV 11 filter captures approximately 50% of volatile organic compounds (VOCs) and 85% of dust particles.
Find the filter near the indoor air handling unit, which is usually located in the basement or utility closet. Note the size (often printed on the frame: 16x25x1 inches, for example).
Remove the filter and hold it up to the light. If it is dark gray or if you can barely see the light through it, replace it immediately.
How often you need to replace it depends on your situation:
- Home with no pets, low dust levels: every 3 months
- With pets: every 2 months
- Allergies or asthma in the family: every month
- During renovation work: every 2–3 weeks
A clogged filter reduces airflow from 30% to 50%, forcing the system to work much harder. This is the most common cause of premature failure.
Step 2 – Clean the coils and fans
This step requires extra care. You can do a surface cleaning, but deep cleaning should be left to a professional.
For the outdoor unit (condenser):
Always turn off the power at the circuit breaker panel before touching the unit. This is a vital safety precaution.
Remove leaves, debris, cobwebs, and dirt that have accumulated around and inside the unit. Use a shop vacuum or a soft brush.
The metal fins on the coil bend easily. If they are bent, air cannot circulate properly. You can buy a fin comb at a hardware store to gently straighten them.
To clean the fins, use a gentle stream of water, rinsing from the inside out. Never use a pressure washer, as it will damage the fins and push dirt deeper into them.
For the indoor unit (evaporator):
The indoor evaporator coil and fan are harder to access. They often require removing panels and a good understanding of the system.
A common myth: «Blowing compressed air is enough to clean.» False. It displaces dust but does not remove corrosion, biofilm, or grease buildup that accumulates over the years.
Professional cleaning involves using non-corrosive degreasers specifically designed for HVAC systems, followed by a thorough rinse. Trying to do this yourself with household cleaning products can damage the aluminum or copper coils.
Step 3 – Check the refrigerant and the lines
This step absolutely requires a certified technician. Handling refrigerant without certification is illegal in Quebec and dangerous.
R-410A refrigerant, used in most modern systems, has been phased out since 2025 due to its environmental impact. New systems use next-generation refrigerants such as R-32.
A system that is low on refrigerant loses up to 30% of its cooling capacity. You notice that your house isn't cooling properly anymore, but you don't know why.
Refrigerant leaks are insidious. They can be microscopic and take years to completely deplete the system. A CMMTQ-certified technician uses ultra-sensitive electronic leak detectors to locate leaks.
Simply recharging the system without repairing the leak is a waste of money. The refrigerant will leak again. A good technician finds and repairs the leak, then recharges the system to the exact pressure specified by the manufacturer.
Air ducts should also be inspected for leaks, disconnected sections, or damaged insulation. Leaky ducts can cause up to 25% of conditioned air to be lost before it reaches your rooms.
Step 4 – Store and Protect the Unit for the Winter
At the end of the air-conditioning season, take a few steps to protect your investment during the Montreal winter.
Thoroughly clean the outdoor unit of leaves and debris. Water trapped with debris can freeze and cause damage.
Some homeowners cover the outdoor unit with a protective cover. This is acceptable, but make sure the cover allows for ventilation. An airtight cover traps moisture and promotes corrosion.
Personally, we recommend covering only the top to protect against falling ice from the roof, but leaving the sides open for ventilation.
Drain the water from the indoor condensate pan, if your system has one. Add a small amount of non-toxic antifreeze (propylene glycol) to the drain pipe to prevent it from freezing and cracking. Temperatures can drop to -20°C or lower in Montreal during the winter.
If you live near a street where a lot of salt is used in the winter, consider installing a barrier or screen to protect the unit from salt spray. Salt dramatically accelerates corrosion.
Step 5 – Annual Professional Inspection
Even if you do everything else yourself, an annual inspection by a certified technician is essential.
A professional measures the CFM (cubic feet per minute) of air flow. For optimal comfort, you need at least 400 CFM per square meter of living space. If the airflow is insufficient, the technician can adjust the fan or identify any obstructions.
Electrical inspections are critical. Loose connections, corroded wires, or worn-out circuit breakers can cause power outages and pose a fire hazard. You can’t spot these problems with the naked eye until it’s too late.
The sensors and thermostat are calibrated to ensure optimal operation. An improperly calibrated thermostat can cause the system to run too often (wasting energy) or not often enough (causing discomfort).
Modern programmable thermostats offer substantial savings. Programming the system to lower the air conditioning by 2–3°C when you’re away can save 10% to 15% on your bills.
An indoor air quality test measures CO₂, fine particulate matter (PM2.5), and relative humidity. A good system keeps CO₂ below 1,000 parts per million (ppm) and humidity between 40% and 60%.
Let a certified INVC technician handle all your maintenance needs—free inspection included at Vortex Air. Call 514-214-7492 to make a reservation now.
Facts and Myths About Central Air Conditioning (in Montreal)
There are many misconceptions about air conditioning systems. Let’s separate fact from fiction to help you make the right decisions.
The Most Common Myths
Myth #1: «A more powerful system cools better»
Fact: An oversized system cools too quickly without removing moisture. The result? A cold but damp and uncomfortable home. Excess energy consumption ranges from 10% to 15%.
Result: Higher utility bills, discomfort, and short cycles that cause premature wear on the compressor.
Solution: Have a professional calculate the appropriate size based on your home’s floor area, insulation, and orientation.
Myth #2: «Turning the thermostat down as low as possible cools the room faster»
Fact: The system always cools at the same rate, regardless of the setting. Lowering the temperature to 18°C when you want it at 22°C only wastes energy (+15%) and makes you uncomfortable.
Consequence: Higher utility bill, risk of forgetting to set the thermostat to a lower temperature and freezing overnight.
Solution: Set the temperature directly to the desired level and let the system do its job.
Myth #3: «I can safely do all the maintenance myself»
Fact: Some tasks (such as changing filters and cleaning surfaces) are safe. However, working with refrigerant, electrical components, and indoor coils requires specialized skills and equipment.
Consequence: Risk of electric shock, exposure to toxic gases, costly damage to the system, and voiding of the warranty.
Solution: Do the basic work yourself, and leave the rest to a certified technician.
Myth #4: «If the summer went smoothly, there’s no need for maintenance the following year.»
Fact: Dust accumulates even during the winter when the system is turned off. The central heating system (if you have one) circulates dust through the same ducts. The coils corrode even when the system is not in use.
Consequence: An unexpected breakdown at the start of the following summer, just when you need the system the most.
Solution: Routine annual maintenance, regardless of the conditions of the previous year.
Verified Facts (2025)
Recent data confirm the importance of preventive maintenance.
AirGreen published a study in 2025 showing that professional maintenance reduces energy consumption by an average of 25%. For a family that spends 1,000$ per summer on air conditioning, that amounts to 250$ in annual savings.
Daikin confirms that regular cleaning of the coils extends the system's service life by 20%. For a system that costs 8,000$ and is expected to last 12 years, this represents an additional 2.4 years or 1,600$ in added value.
CAA-Québec estimates that 80% of air conditioning breakdowns can be prevented with proper preventive maintenance. That’s a huge number. Four out of five breakdowns are completely preventable.
Career Interview: What a Certified Technician in Montreal Actually Does
Understanding what a professional brings to the table helps justify the investment and choose a high-quality service.
Comprehensive Inspection and Diagnosis (Before/After)
The technician always begins with a thorough inspection of the entire system.
He uses an inspection camera to look inside the coils and detect buildup that is invisible to the naked eye. The coils may look clean on the surface but be completely clogged on the inside.
The airflow test accurately measures how much air is circulating through the system. Low readings indicate blockages, dirty filters, or a malfunctioning fan.
Seals and connections are checked for air leaks that reduce efficiency. A significant leak can cause 20% to 30% of conditioned air to be lost before it reaches your rooms.
At the end, you’ll receive a report with before-and-after photos, detailed measurements, and an estimate of the energy saved after the service. At Vortex Air, we show you exactly what we found and what we fixed.
System Cleaning and Calibration
Professional cleaning goes far beyond just a quick wipe-down.
The coils are gently brushed with specialized tools that do not damage the fins. A professional degreaser dissolves grease buildup and biofilm without corroding the metal.
Temperature and pressure sensors are cleaned and calibrated. Dirty or improperly calibrated sensors send incorrect information to the system, causing it to operate inefficiently.
The thermostat has been tested and adjusted. Modern smart models are programmed to optimize comfort and energy savings. The technician can show you how to use all the features you may not be aware of.
The final flow rate test confirms that the system is now operating at maximum efficiency. You can see the difference in concrete numbers, not just in subjective impressions.
Certification and Local Compliance
Certified technicians comply with strict industry standards and Quebec regulations.
INVC certification ensures that technicians are familiar with safety protocols, best practices, and quality standards. The CMMTQ oversees building mechanical contractors and requires continuing education.
At Vortex Air, we are currently finalizing our NADCA certification, the international standard for HVAC system cleaning and inspection.
Compliance with the Quebec Building Code and Decree 991-2025 protects your investment and ensures that the work is done properly. If you sell your home, these documents prove that you have properly maintained the systems.
Book your certified service appointment today: free inspection, transparent quote, local service. Call Vortex Air at 514-214-7492.
Why choose Ventilation Vortex Air in Montreal?
We’ve been servicing air conditioning and ventilation systems in the Greater Montreal area for over 10 years. We’ve seen every type of system, every level of maintenance (or neglect), and every kind of situation.
More than 500 Montreal families and businesses trust us. Here's what sets us apart.
Local, certified, and bilingual technicians
Our five technicians are familiar with the unique characteristics of Montreal homes and condos: the old multi-unit buildings in Ahuntsic with their narrow ducts; the bungalows in Brossard with their outdoor units exposed to road salt; and the downtown condo towers with their complex systems.
We are INVC-certified and in the process of obtaining NADCA certification. Mohamed and Omar, our co-owners, personally oversee major contracts and ensure that every client is satisfied.
We speak both French and English fluently. In a multicultural city like Montreal, it helps to have technicians who can explain things clearly in the language of your choice.
Service 7 days a week with a free inspection
We work whenever it’s convenient for you. Need a service on Saturday afternoon? Sunday morning before the forecasted heat wave? We’ll work around your schedule.
The initial inspection is always free and comes with no obligation. We’ll give you an honest assessment of your system’s condition, explain what needs to be done, and let you decide.
If your system is in good condition, we'll tell you straight up. We never push unnecessary services. Our reputation is built on our honesty, not on aggressive sales tactics.
Satisfaction Guarantee and Complete Transparency
We stand behind our work. If you're not satisfied, we'll come back and fix the problem at no additional cost.
Our prices are fixed and transparent. We’ll provide you with a detailed estimate before we begin. No hidden fees, no surprises at the end. If we discover an unexpected problem during the service, we’ll let you know before taking any action.
You will always receive a comprehensive report with photos, measurements, and personalized recommendations tailored to your specific situation.
Unique expertise: air conditioning + ventilation + decontamination
What really sets us apart? We don't just install air conditioning. We specialize in everything related to indoor air quality.
We can service your air conditioning system, clean your ventilation ducts, inspect your air exchanger, and address issues related to mold or contamination. This comprehensive expertise allows us to identify problems that others overlook.
Sylvie d’Ahuntsic recently told us: «I called on Vortex Air to service my air conditioner. The technician noticed that my air exchanger wasn’t working properly, which explained why the air always felt stuffy even with the air conditioning on. He fixed both problems the same day. Now my house is really comfortable.»
Patrick, owner of a duplex in Rosemont: «Omar came to service my two air conditioning units. He took the time to explain exactly what he was doing and why. He also showed me how to optimize my thermostats to save money. Impeccable service, fair prices. I recommend him to all my neighbors.»
Caroline de Brossard: «During the July heat wave, my air conditioner broke down. I called Vortex Air in a panic. They found a slot for me the very next morning, even though they were swamped. The technician quickly found the problem—a completely clogged coil that I’d never had cleaned. Two hours later, everything was working perfectly. They saved my life.»
Areas Served Throughout Greater Montreal
We cover all the boroughs of Montreal: Ahuntsic, Rosemont, Plateau-Mont-Royal, Ville-Marie, Côte-des-Neiges, Verdun, LaSalle, and all the others.
We also serve Laval, Longueuil, Brossard, Saint-Lambert, Boucherville, the entire North Shore, and the South Shore. If you're in the metropolitan area, we'll come to you.
Call Vortex Air at 514-214-7492 or book online at vortexair.ca — your comfort starts with proper maintenance.
FAQ – Central Air Conditioning System Maintenance in Montreal (2025)
How often should a central system be maintained?
For a system used only in the summer, one professional maintenance service per year in the spring is sufficient. For a heat pump that is also used for heating, two maintenance services per year (in the spring and fall) are recommended. Between professional service visits, check and replace the filters at least every 3 months.
How much does HVAC maintenance cost in Montreal?
A comprehensive maintenance service typically costs between 150$ and 300$, depending on the complexity of the system and what is included. It’s an investment that pays for itself through energy savings (200$ to 300$ per summer) and by avoiding emergency repairs that can easily cost 800$ to 1,500$.
How can I tell if my air conditioner is clogged with dirt?
Signs include: longer cooling times, higher electricity bills, unpleasant odors when the system is running, unusual noise or vibrations, certain rooms that are no longer cooling properly, and ice forming on the outdoor unit. If you notice one or more of these symptoms, schedule an inspection.
What is the average lifespan of a system?
A well-maintained central air conditioning system lasts between 12 and 15 years. Without regular maintenance, its lifespan drops to 8 or 10 years. Professional maintenance can extend the system’s life by 20% to 30%, which represents an additional 3 to 5 years of service.
What does the performance review cover?
A comprehensive service includes: visual inspection of all components, cleaning of the indoor and outdoor coils, checking and recharging the refrigerant if necessary, testing electrical connections, calibrating the thermostat, cleaning the condensate pan, measuring airflow, and a detailed report with recommendations.
Can you do the cleaning yourself?
You can perform basic maintenance: change the filters regularly, clean around the outdoor unit, and remove visible debris. However, deep cleaning of the coils, checking the refrigerant, and inspecting the electrical system require a certified professional for safety and efficiency reasons.
Which products should you avoid?
Never use bleach, corrosive chemicals, or high-pressure washers on the system’s components. They can damage the aluminum or copper coils, the delicate fins, and the seals. Use only soft water and, if necessary, cleaners specifically designed for HVAC systems.
How can I protect my unit during the winter?
Thoroughly clean the outdoor unit before winter. You can cover the top to protect it from falling ice, but leave the sides open for ventilation. Drain the water from the condensate pan and add non-toxic antifreeze to the drain. If you live near a busy street, protect the unit from salt spray.
Are interviews required for grants?
Yes, since 2025, Hydro-Québec and the LogisVert program have required proof of regular maintenance by a certified technician in order to qualify for grants. You must provide maintenance reports for the past three years. This is yet another reason to maintain a rigorous maintenance schedule.
Does Vortex Air serve Laval and the South Shore?
Yes, we serve the entire Greater Montreal area, including all of Montreal’s boroughs, Laval, Longueuil, Brossard, Saint-Lambert, Boucherville, and all cities on the North Shore and South Shore. Call us at 514-214-7492 to confirm service in your area.
Take care of your system now
Now you know exactly how to maintain your central air conditioning system, why it's crucial, and when to call a professional.
Preventive maintenance isn't an expense—it's a smart investment that pays off in energy savings, comfort, and peace of mind.
Don't let your system fail you during the next heat wave. Don't waste hundreds of dollars every summer on wasted energy. Don't shorten the life of your equipment by several years through neglect.
Call Ventilation Vortex Air at 514-214-7492 or visit vortexair.ca To schedule your professional consultation with a free inspection.
Our INVC-certified technicians—and soon-to-be NADCA-certified technicians—are available 7 days a week throughout the Greater Montreal area. Transparent service, fair prices, and a satisfaction guarantee.
More than 500 Montreal families have already placed their trust in us for their air conditioning, ventilation, and indoor air quality.
We serve Ahuntsic, Rosemont, the Plateau, downtown, Laval, Longueuil, Brossard, and the entire metropolitan area.
Breathe easier. Live comfortably. Save smartly.
Your summer starts with a well-maintained system. Contact us today.
