Aire One Heating & Cooling has been a licensed heating, cooling and indoor air quality contractor in Ontario since 1990, working across Markham, Richmond Hill, Vaughan, Thornhill, Scarborough, North York and Toronto from 2800 John St, Unit 9, Markham. Twenty four hour line: 310-4328.

The short answer. Dirty air filters are the most overlooked cause of weak summer cooling. A clogged filter blocks the airflow your air conditioner needs to pull heat out of your home, so it cools weakly, runs longer cycles, and can ice up the indoor coil until it stops cooling at all. ENERGY STAR says to check the filter every month during heavy-use months and change it at a minimum every three months. Whether that saves you a specific percentage on an Ontario hydro bill is a claim nobody can make honestly, and section .03 explains why.

What the filter is actually there for

Most people assume the filter is there to clean the air they breathe. That is a side benefit. Its first job is to protect the machine.

Your indoor unit pulls household air across a cold evaporator coil, the finned surface that absorbs heat and moisture out of the air. The filter sits in front of that airflow and catches dust, lint, pollen and pet hair before they land on the coil. Carrier, whose equipment we install, puts it plainly: the filter traps pollutants that would otherwise coat the components and choke the machine from the inside.

That gives the filter two jobs that pull against each other. It has to be dense enough to catch particles, and open enough to let air through. When it loads up with debris, the second job fails first, and the whole system feels it.

What a clogged filter does to summer cooling

Airflow is not one symptom among many. It is the thing everything else depends on. When it drops, the failures arrive in order.

Weaker cooling first. Less air across the coil means less heat carried out of the house per minute. On a mild day you may not notice. On the hottest afternoon of the year, the system simply cannot keep up, and the thermostat never reaches its setting.

Longer run times next. The thermostat measures temperature, not effort. It keeps calling for cooling because the target is never met, so the system runs and runs. This is the part homeowners misread as a dying air conditioner.

Then ice. This is the one that surprises people. Restricted airflow lets the coil drop below freezing, and the moisture condensing on it turns to ice. A frozen coil blocks airflow further, which makes more ice. Cooling stops completely, and the melt can leave water where you do not want it. If you see ice, shut the system off at the thermostat and leave the fan running to thaw it.

And dirt where it does not belong. ENERGY STAR notes that a clean filter also keeps dust and dirt from building up inside the system, which is what leads to expensive maintenance or early failure. Once the coil itself is coated, a new filter will not undo it. That is a service call with tools.

The 5 to 15 percent figure, and what happened to it

If you have read anything about air filters, you have seen this sentence: replacing a dirty, clogged filter with a clean one can lower your air conditioner’s energy consumption by 5 to 15 percent, according to the U.S. Department of Energy. It is on hundreds of HVAC company blogs. It was in the earlier draft of this very page.

We went to check it on 17 July 2026. Here is what we actually found.

The number is real, but its source page is gone. The URL that nearly every site cites for it, energy.gov/energysaver/maintaining-your-air-conditioner, now returns a 404. The Department of Energy’s current Energy Saver page on air conditioner maintenance describes the mechanism, that dirty filters reduce airflow and let dirt reach the evaporator coil, but it no longer publishes the 5 to 15 percent figure at all.

The figure does still exist in a DOE-hosted document: the Energy Saver 101 home cooling infographic, which states that routinely replacing or cleaning your air filters can lower an air conditioner’s energy consumption by 5 to 15 percent. That PDF carries no publication date and sits on a legacy path.

And the citation chain is drifting. Carrier Canada’s own air filter page still quotes the figure, footnotes it, and that footnote links to the dead DOE URL. Carrier also restates it as a 5 to 15 percent increase in efficiency, which is not the same claim as a 5 to 15 percent reduction in consumption. Those two sentences describe different arithmetic.

So here is our position, and you can hold us to it. The figure came from the DOE, it is a reasonable order of magnitude, and we have no better one. But it is a United States estimate with no stated test conditions, no date, and no Ontario context. It was never a promise about your hydro bill, and anyone who prints it next to a dollar amount for your house is guessing.

What is worth doing does not depend on the number. A filter costs a few dollars and five minutes. The coil it protects, and the compressor behind that, do not.

Month between checks, per ENERGY STAR

Months, ENERGY STAR minimum change

MERV, EPA floor for an upgrade

Top of the MERV scale, per Carrier

How often to change it

There is a floor and there is a judgement call. The floor comes from ENERGY STAR: check your filter every month, especially during heavy-use months such as winter and summer, and if it looks dirty after a month, change it. At a minimum, change it every three months.

The judgement call is everything else, and it depends on your filter and your household.

Carrier also lists what shortens every one of those intervals: poor indoor air quality from smoking, candles, a wood stove or nearby construction; allergy or asthma sufferers in the home; multiple pets; a larger home moving more air; and heavy use, including running the fan continuously. If two or three of those describe your house, treat 30 days as the interval and stop reading charts.

One habit beats any schedule. Write the date on the cardboard frame with a marker when you install it. The guesswork is the actual problem.

MERV, and why higher is not automatically better

MERV stands for Minimum Efficiency Reporting Value. It is the industry scale for how well a filter traps airborne particles, and it runs from 1 to 16, with 16 catching the most. The word minimum matters: it reflects the filter’s worst-case performance in testing, not its best.

The U.S. EPA’s guidance is that if you upgrade, choose a filter rated at least MERV 13, or as high as your system fan and filter slot can accommodate. The EPA also notes that filters rated MERV 13 and above must demonstrate at least 50 percent removal efficiency for the smallest particles tested.

Now the part the filter aisle does not tell you. A denser filter is harder to pull air through. Push the MERV higher than your blower and your filter slot were designed for, and you recreate the exact problem this article is about: restricted airflow, weak cooling, a coil that wants to freeze. The EPA’s own wording carries the escape hatch, “as high as your system can accommodate,” and it says you may need an HVAC technician to work out what that is. Carrier suggests MERV 12 to 16 specifically for homes with allergy or asthma sufferers, which is a different question from what your ductwork can breathe through.

Read this before you upgrade. A high-MERV filter in a system that cannot handle the pressure drop is worse than the basic filter it replaced. If you want better filtration, the right move is usually a thicker filter with more surface area in a proper media cabinet, not a denser one crammed into a 1 inch slot. Ask before you buy, not after the coil ices up.

What a clean filter cannot fix

We sell air conditioners and we service them, so take this section as the one where we argue against our own marketing. A filter change is the cheapest thing you can do, which is exactly why it gets oversold as a cure.

A fresh filter will not fix any of these:

• An undersized or badly installed system. If the equipment was wrong for the house on day one, no filter changes that. It will run long cycles forever.
• Low refrigerant. Refrigerant is not consumed. If the charge is low, there is a leak, and topping it up without finding the leak is throwing money into the air.
• A coil that is already dirty. Once dust has bypassed a loaded filter and coated the evaporator, cleaning it is hands-on work. A new filter stops it getting worse and does nothing about what is already there.
• Leaky or undersized ducts. Air lost into an attic or crawlspace never reaches a room. ENERGY STAR estimates sealing and insulating ducts can improve system efficiency by as much as 20 percent, and that is a separate job.
• A failing compressor or blower motor. Poor airflow shortens their lives. It does not resurrect them.
• Humidity you can feel. If the house is cool and still clammy, that is usually sizing, run time or ventilation, not filtration.

If you changed the filter and the house still will not cool, the filter was not the problem. That is useful information, and it is worth more than another trip to the hardware store.

When to call a licensed technician

Changing a filter is a five minute job you should do yourself. Shut the system off at the thermostat, find the filter in the return-air grille or at the indoor air handler, note the size printed on the frame, slide the old one out, slide the new one in with the airflow arrow pointing toward the blower, and write the date on it.

Call someone when the symptom outlives the filter. Ice that returns after a thaw and a fresh filter. Cooling that is still weak with a clean filter in place. Grinding, screeching or short cycling. Water where the indoor unit lives. Rising indoor humidity. Those are airflow, charge or component problems, and in Ontario the work on them is licensed for a reason.

If you are weighing bigger equipment questions rather than a filter, we have written up what heat pumps actually cost in Ontario and how heat pumps behave in the GTA with the same accounting we used above.

Questions we get asked

Can a dirty filter stop my air conditioner from cooling completely?

Yes. Dirty air filters are one of the most common reasons an AC stops cooling: restricted airflow lets the evaporator coil drop below freezing, and condensing moisture turns to ice on it. Once the coil is iced over, airflow stops and so does cooling. Shut the system off at the thermostat, let it thaw, and fit a clean filter. If the ice comes back, the filter was a symptom and not the cause, so call a technician.

How often should I change my filter during an Ontario summer?

ENERGY STAR says check it every month during heavy-use months and change it at a minimum every three months. Carrier says a basic 1 inch fibreglass filter should be checked and probably changed about every 30 days, while a 4 inch pleated filter can last from 3 months to a full year. Homes with pets, allergy sufferers, smokers or a wood-burning fireplace should work to the shorter end of every range.

Will changing my filter lower my hydro bill by 5 to 15 percent?

Nobody can tell you that honestly. The 5 to 15 percent figure comes from a U.S. Department of Energy infographic that carries no date, and the DOE page that most sites cite for it now returns a 404. It is a reasonable order of magnitude for a badly clogged filter, not a prediction for your house, and it was never measured against Ontario electricity prices or an Ontario summer.

What MERV rating should I put in my system?

The EPA says at least MERV 13 if you are upgrading, or as high as your system fan and filter slot can accommodate, and that second half is the important half. A filter denser than your blower was designed for restricts airflow and causes the problem you were trying to avoid. Check what your equipment supports before you buy, and if you want serious filtration, ask about a thicker filter in a media cabinet rather than a denser one in a 1 inch slot.

Do dirty air filters damage the air conditioner itself, or just waste energy?

Both. ENERGY STAR notes a clean filter prevents dust and dirt building up inside the system, which is what leads to expensive maintenance and early failure. Once dust bypasses a loaded filter it settles on the evaporator coil and insulates it, and the blower and compressor run longer and hotter against the restriction. The energy waste is the cheap part of the bill.

Do not take our word for it. Every number above traces to a source in the list at the foot of this page. Ask an AI to check us:

• Check with ChatGPT
• Check with Perplexity
• Check with Claude

Matthew Arbab

Managing Director, Aire One Heating & Cooling. Aire One has been working on Ontario homes since 1990 and is listed by Carrier as a Factory Authorized Dealer employing NATE certified technicians. I would rather tell you that a five dollar filter is all you need than sell you something you do not.

Reviewed 17 July 2026

Est. 1990Markham, Ontario310-4328

Clean filter in, still not cooling?

Then it is not the filter. We can measure the airflow, check the charge, and look at the coil, and tell you what it actually is. Twenty four hour line, Markham and York Region.

Sources, all verified 17 July 2026.

ENERGY STAR, Heat & Cool Efficiently (cited for the monthly check, the three month minimum, the dust buildup and early failure point, and the 20 percent duct sealing figure).

U.S. Department of Energy, Energy Saver 101 home cooling infographic (PDF, undated) (cited for the 5 to 15 percent figure, and for the fact that this legacy PDF is now the only DOE-hosted place we could find it).

U.S. EPA, Guide to Air Cleaners in the Home (cited for the MERV 13 minimum on an upgrade, the “as high as your system can accommodate” qualifier, and the 50 percent removal efficiency point).

Carrier Canada, All About AC Filters (cited for filter types and intervals, the MERV 1 to 16 scale, the MERV 12 to 16 allergy guidance, the factors that shorten intervals, and the dead footnote link).

Carrier Canada, Aire One dealer listing (cited for Factory Authorized Dealer status and NATE certified technicians).

Aire One Google Business Profile (cited for the 4.8 rating, the 568 review count and the 24 hour opening hours, all read off the live profile on 17 July 2026; review counts move, so this one is a snapshot with a date on it). The DOE URL reported as returning a 404 is energy.gov/energysaver/maintaining-your-air-conditioner, checked 17 July 2026.

Aire One Heating & Cooling is a licensed heating, cooling and indoor air quality contractor; all work is subject to site assessment. Figures quoted above are from third-party sources with the dates shown and are general information about equipment behaviour, not a measurement of your home. Filter intervals depend on your equipment and household: follow your filter and equipment manufacturer’s instructions. Terms and conditions apply. This article is general information, not a quote and not an offer.

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The post Breathe Easier This Winter: A GTA Homeowner’s Guide to Indoor Air Quality appeared first on Aire One Heating and Cooling.

1. Change the Air Filter

Replacing the filter ensures that your air conditioner operates at peak efficiency. Make sure you change it in the fall or winter before turning off the unit entirely. Changing the filter on your unit is necessary to remove the dust preventing it from operating efficiently.

2. Clean the condenser coils

It’s the ideal time to inspect the condenser coils, which can become dirty and congested with debris after prolonged use. The exterior HVAC unit fins should also be vacuumed or cleaned of any debris. Inspect the fins to determine any potential damage and adjust them if required. Your unit runs more effectively when the coils are clean. Clogged coils may contribute to your unit’s inability to maintain the ideal temperature in your home.

3. Visually inspect your unit

It would be best if you did not allow the summer to end without investigating any strange sounds or smells you may have noticed. You should check the wiring for issues such as frayed connections caused by animals and insects inside the unit. Check for any damaged components, and have them repaired immediately.

4. Clean up the system’s surrounding

Clean up the area around the unit to optimize the performance of your unit. Its operation may be hampered by too much obstruction, which could lead to an early system failure.

5. Schedule a Professional HVAC Maintenance Checkup

You might as well have an HVAC technician from Aire One Heating and Cooling operating in Toronto & GTA checkup your air conditioner thoroughly in addition to giving it a visual check yourself. A skilled technician can perform a wide range of preventative maintenance tasks to guarantee that your air conditioner runs as effectively and efficiently as possible.

How to Maximize Your AC Maintenance Routine

Follow the suggestions above to keep your unit running smoothly throughout the year. If your unit hasn’t been inspected, that’s a really bad situation. If you had maintenance performed relatively early in the year, before summer ends are the ideal time to have it done again. Contact Aire One Heating and Cooling to check your AC unit professionally.

The post AC Maintenance to End the Summer Season appeared first on Aire One Heating and Cooling.

Dust is mainly made up of tiny particles in the air. It comprises organic matter such as skin, hair, and dryer lint, including more durable materials like fabric fibers from clothes and furnishing materials. It can also come from pollen, spores released by fungus or molds, and other particles floating in the air.

What Is the Best Thing to Use for Dusting?

Microfiber cloths are perfect for cleaning because they pick up dust and get into the cracks and crevices of your furniture better than normal cloths or paper towels.

How Often Should You Change the Air Filters and Why it is Important

Depending on the amount of traffic you have in your house, the air filters in your home should be changed after three months. This is because they get filled up with dust particles, which means they can no longer perform their job of filtering the air getting in for indoor air quality. Changing the air filters is important because it prevents you from getting ill.

Three Tips on How to Lower the Dust at Home

1. Vacuum Frequently

Since most dust comes from outside, the best place to start is by vacuuming the floors of your house. Vacuuming will remove dust, pollen, and other particles before entering your air ducts. After vacuuming the floors, it’s a good idea to open all the doors and windows in your home and turn on the ventilation system.

2. Declutter

Some areas in your home might be filled with clutter and stuff that is just gathering dust. You want to make sure you control this chaos when figuring out how to reduce dust in your home. Decide which sections of your house are the most cluttered, such as the mudroom, closets, or kitchen counter, and ask for the assistance of your family to keep these spaces and surfaces neat.

3. Use an Air Purifier

Air purifiers are best at removing allergens by trapping them in a filter. This is why they’re an effective way to remove dust in your house. You can get air purifiers designed specifically for use in the house. Consult with professionals at Aire One Heating and Cooling in Ontario to help you choose the best product for your home.

You can lower dust in your house by cleaning the floors, decluttering your home, and using an air purifier. Remember to clean often and change your air filters as needed. Call us today if you have any questions.

The post Why Is There so Much Dust in My House? appeared first on Aire One Heating and Cooling.

1. An Overused Filter Can Raise Your Energy Consumption

Your energy expenditure for heating and cooling your home or office can increase if you don’t change your air filter regularly. A clogged filter restricts airflow, making your system work harder to circulate air, resulting in higher energy bills. Change your air filter every three months or as needed to minimize energy costs. Consult the owner’s manual of your furnace or HVAC system to find out how often to change the filter.

2. Air Filters Are Not Created Equal

The three main types of air filters are mechanical, activated carbon, and ultraviolet (UV) light air purifiers. Research the different types to find the best one for your needs. Mechanical filters work by trapping particles as air passes through the filter, while activated carbon filters remove gaseous contaminants from the air. UV light purifiers use ultraviolet light to kill airborne bacteria and viruses. Get a professional from Aire One Heating & Cooling to help you select the best air filter for your needs.

3. The Higher The MERV Rating, The Better The filter

MERV (Minimum Efficiency Reporting Value) is a rating system that measures how well an air filter can remove particles from the air. The higher the MERV rating, the smaller the particles it can remove. A MERV 8 air filter can remove most dust and pollen particles, while a MERV 13 air filter can also remove small particles, such as smoke and bacteria. If you are prone to allergies or respiratory problems, consider a filter with a higher rating. The environment in your home or office will also dictate the type of air filter you need. For example, if you live in a dusty area, you may need a more powerful air filter than someone living in a cleaner environment. However, high-rated filters can also restrict air flow, so choosing a filter that balances efficiency and airflow is crucial.

Indoor air quality is a looming concern for many people. With some knowledge, you can breathe easy knowing that you’re taking steps to improve your indoor air quality. If you need your HVAC system checked or maintained in Ontario, Aire One Heating and Cooling has a team of experts to get the job done right the first time. Contact their customer service today to get more information

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How Does The AC Cause Sickness?
The chilly air that air conditioners produce is not necessarily hazardous. When air conditioners, bacteria, allergens, fungi, mold, and mildew come together, they may cause sickness. Condensation is created as air is forced over the coils of an air conditioner. If the air conditioner is not cleaned regularly, the moisture from this condensation can provide an ideal breeding ground for germs and mold to develop.

Another cause of air conditioning sickness is running an air conditioner too cold. The cold air can cause your nasal passages to shrink, causing blockage and congestion of the sinuses or even the lungs. It is important to keep the temperature of an air conditioner to a comfortable level.

Importance of AC Maintenance
Routine AC maintenance is the easiest and least expensive way to prevent AC sickness. You must know your air conditioner’s maintenance needs and keep up with them regularly.

An air conditioner should be serviced at least once a year. This allows the technician to inspect the AC for mold, mildew, dirt, and dust. The technician will also clean the coils inside the unit and check for proper operation, corrosion and leaks. They will also make sure your unit is running at peak efficiency.

Contact Us Today To Book A Maintenance Appointment
Air conditioners can be a breeding ground for bacteria, fungi, and mildew. Mold spores can grow on wall grills or dust particles in the air conditioner vents. If you notice mold growth in your vents, contact Aire One Heating & Cooling. While breathing in this kind of mold may not cause sickness immediately, prolonged exposure to it can lead to an irritated throat and lung infection.

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The post Can I Get Sick From My AC? appeared first on Aire One Heating and Cooling.

Any heating and cooling company will tell you; a furnace air filter is critical to keeping your home clean and your hvac system operating properly. In the past the use of disposable air filters were the standard. Today, many families are choosing a washable furnace filter instead.

Get to Know Your Options

If you have been using the disposable type of air filter, you want to be educated about your options for a washable air filter. Just think about how it will feel to purchase one filter instead of having a stack of them stored in the garage, and replacing them every three month. Simply washing your new filter monthly will give your family more comfort and better health.

When you switch to a washable furnace filter you are not adding fiberglass, polyester, cardboard, or cotton to your landfill footprint. If you are environmentally conscious, considering a washable furnace filter may be no brainer. Aire One licensed technicians can discuss your options with you.

MERV Ratings

Select the proper MERV (Minimum Efficiency Reporting Value) rating to fit your needs. The term MERV is an industry standard developed in 1987. The higher the number indicates the best level of filtration.

The MERV scale ranges from 1-16. It’s best to ask experts at Aire One, a heating and cooling company with over 30 years of experience, to give you advice about what is right for your home.

Cleaning Washable Furnace Filters

These “permanent” filters need to be cleaned regularly. For most people this means a monthly cleaning, but the American Lung Association says you must clean it every three months at a minimum.

Simply place the dirty filter on a level surface with the dirty side up. Vacuum carefully to pick up as much of the dirt, debris, and dust as you can. Take the vacuumed filter to a large utility sink or bathtub, and thoroughly wash with warm water. It can be helpful to use a sprayer to increase the water pressure. Do not use soap on the filter, and let it dry before returning to the furnace.

If you have any questions what type of filters are best for your furnace, contact us today.

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Your heating and cooling systems are essential for the comfort of your home. It’s necessary to maintain your HVAC system to ensure it functions properly and efficiently. You can also prevent expensive repairs by having your heating and cooling units maintained by a professional. If you’re HVAC isn’t working the way it should, then it’s probably one of these four common heating and cooling problems.

Heat Isn’t Dispersed Evenly Throughout The House

You may notice some rooms feel chillier than others, or that there’s no heat at all in some rooms. This could be caused by closed vents, dirty air filters or duct problems.

No Heat In The Entire House

If your heat isn’t coming on at all, then you’ll want to check the thermostat to make sure it’s set high enough for the heat to come on. If you rely on a furnace for heating, then it may have a part that needs replacing, dirty evaporator coils or filters.

Your Furnace Is Leaking

A little condensation is normal for a furnace, but if it’s leaking water, then it’s a sign of trouble. If this is the case, then you may have a clogged drain or pipe which is stopping the furnace from turning on.

Low Pressure In The Boiler

Boilers and radiators need constant water pressure to work properly. If your pressure gauge is low, then you may have a leak in the drainage pipes. Bleeding the radiator also can create low pressure in the system since the pressure drops as the air is released from the system.

When Should You Call A Heating And Cooling Professional?

It can be frustrating when your heat stops working, especially during the chill of winter. There are some things that you can do easily to fix the problem such as opening a vent or changing a clogged air filter. However, mechanical, electrical and ductwork issues should all be handled by a experienced and licensed professionals from Aire One, heating and cooling company, operating all over Ontario. Don’t forget to book annual maintenance to keep your equipment operating safely and efficiently. Contact us today and receive a 24-hour emergency service.

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Indoor air can be up to five times more polluted than outdoor air. HEPA filters can trap these pollutants, minimize indoor pollution and increase the air quality inside your home. Allergy, asthma or respiratory sufferers will feel a significant difference in air quality and housekeeping time will be drastically reduced.

What is a HEPA Filter?

HEPA is an acronym for High Efficiency Particulate Air, so a HEPA filter is a High Efficiency Particulate Air filter.

HEPA filtration is an important and popular form of air purification technology.

To be called a true HEPA filter, it has to be tested and approved, so you know exactly what to expect. The Institute of Environmental Sciences and Technology dictates that a HEPA filter must trap 99.97% of particulates 0.3 microns or larger. This does not mean that the filter cannot trap particles smaller than 0.3 microns, because many HEPA filters can; it is simply the requirement that must be met in order to carry the HEPA name.

Call 310-4328 or 310-HEAT (no area code required) for more information.

A HEPA filter is the best kind you can get, as it removes more than 99% of particles that are 0.3 microns or larger in size.

Contact the local Aire One Office in your area to check our promotions and deals to get the best price!

Metro Toronto, York, Richmond Hill, Markham, Newmarket, Aurora, Keswick, Hamilton, Burlington, Oakville, Kitchener, Cambridge, Guelph, Durham, Simcoe, Etobicoke, Mississauga, Brampton, London, St. Thomas, Woodstock, Waterloo, St. Catharines, Niagara, Ajax, Whitby, Oshawa, Pickering, Bowmanville, Vaughan, Sharon, Scarborough, North York, Thornhill, Schomberg, Brantford, Barrie, Alliston, Orillia, Cookstown, Innisfil, Malton, Caledon, Bolton, George town, High Park, Weston, Tottanham, Beeton, Georgina.

How do HEPA filters work?

HEPA filters trap air contaminants in a complex web of fibers. Depending on the size of the particle, this can happen in four different ways: Inertial Impaction, Diffusion, Interception, or Sieving.

Larger contaminants are trapped via inertial impaction and sieving. The particles either collide with the fibers and become trapped or are trapped while attempting to travel through the fibers. Medium sized particles, as they move through the filter, are grabbed by the fibers via interception. Smaller particles are dissipated as they travel through the filter and eventually collide with a fiber and are trapped.

With HEPA technology, you can be sure that contaminants will be trapped and removed on a microscopic level.

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