Air Conditioning Maintenance: The 12-Point Check Explained

By Mario Vaghei, General Manager, Aire One Peel Heating & Cooling · Published June 23, 2022 · Facts verified September 3, 2026

Air conditioning maintenance is sold as one product and delivered as about four different ones. A $79 CAD spring special and a full seasonal visit both get called a tune-up, both end with a sticker on the cabinet, and the difference only shows up in July when one system is still holding temperature and the other is not. This page lists what a complete visit actually covers, item by item, so you can read a quote instead of guessing at it. If you are earlier in the season and just want the homeowner steps, our spring AC checklist covers those.

What does air conditioning maintenance include?

A complete visit covers twelve checks, and they fall into three groups: airflow, refrigerant, and electrical. Every one of them exists to protect the compressor, which is the single most expensive part in the system and the one that fails when the other eleven are neglected. Table 1 is the list. Bring it to whoever quotes you and ask which lines are included.

Table 1. Compiled from Natural Resources Canada's guidance on central air conditioner maintenance and from manufacturer service instructions, September 3, 2026. This is what a complete visit covers in practice; it is not a regulated standard, so ask any contractor which of these twelve their price includes.

Why airflow is the thing every check protects

Almost every item in Table 1 is protecting one thing, and it is not efficiency, it is the compressor. Natural Resources Canada puts the chain plainly: "Dirty filters and dirty indoor and outdoor coils and fans reduce airflow through the system. This reduction in airflow decreases system efficiency and capacity and can lead to expensive compressor damage if left for an extended period of time." Refrigerant works the same way. NRCan states that "a small loss of refrigerant can cause a significant drop in efficiency", which is why checks 5, 6 and 7 exist as measurements rather than as a glance at the gauge.

Four statements from Canadian and Ontario authorities do most of the work on this page, and it is worth seeing them in one place with what each actually means for a homeowner. Table 2 sets them out. Everything else here is either our own service experience or a manufacturer's own warranty wording, and it is labelled as such.

Table 2. Statements read directly from the source pages listed in the references, September 3, 2026. Wording is condensed for the table; the exact quotations appear in the body text above and in the FAQ.

What a cut-price tune-up leaves out

A very cheap seasonal special is usually a real visit with the four slowest items removed, and those four are the ones that catch problems early. None of this makes a low price dishonest; it makes it a different product, and the quote rarely says so. Table 3 lists what tends to disappear first and roughly how long each takes, because time is what the price is actually buying.

Table 3. Based on what our technicians find when they take over a system that has been on cheap annual specials, across Mississauga, Brampton and the surrounding cities. September 3, 2026.

Who is allowed to touch the refrigerant in Ontario?

In Ontario, only a certified person may handle the refrigerant in your air conditioner, and that is law rather than industry preference. Under the Environmental Protection Act and Ontario Regulation 463/10, Ozone Depleting Substances and Other Halocarbons, the province states that a certified technician is the only person who can remove, discharge, handle and dispose of these refrigerants. The card is the Ozone Depletion Prevention certificate, it is valid for five years, and on its own it permits handling refrigerant rather than repair work, which is a separate trade qualification. This is the practical line between what you can do yourself and what has to be booked.

Table 4. Certification requirement from the Government of Ontario's refrigerant handling page and O. Reg. 463/10, verified September 3, 2026. Applies province wide, so the same rule holds in Mississauga, Brampton, Etobicoke, Milton, Georgetown, Caledon and Bolton.

How often, and what does it cost?

Once a year, before the cooling season, is the interval for a central air conditioner. The filter is the exception, because it is on its own schedule and depends on thickness rather than the calendar; our guide on how often to replace air filters sets out the intervals. Table 5 covers the two ways people pay for the annual visit. A plan makes sense if you would otherwise forget to book, or if you want parts and labour covered; paying per visit makes sense if your system is newer and you are organised about it.

Table 5. Cooling plan pricing read from the Aire One Peel protection plans page on August 17, 2026. Combined heating and cooling plans are priced separately on that page. Confirm current pricing before you sign.

One honest note on the plans, since we sell them. If your system is two years old, in good condition and you reliably book the visit yourself, a plan is convenience rather than savings, and paying per visit is the cheaper path. The plans earn their money on older equipment, where a single covered repair can exceed a year of payments.

Does skipping maintenance void the warranty?

Not automatically, and the earlier version of this article overstated it. What manufacturer terms actually say is narrower: Carrier's residential limited warranty excludes failure or damage caused by improper servicing, and requires that installation, use, care and maintenance be normal and in accordance with the instructions in the owner's manual. So a compressor that fails because the coils were never cleaned can be refused on those grounds, while a random control board failure on an unmaintained system generally is not. The thing that most often decides what you are actually owed is registration, not maintenance: register within 90 days and the parts term is typically ten years, miss it and it falls back to five. Our air conditioner warranty guide covers the terms, the 90-day rule and what genuinely voids coverage in detail; there is no point repeating it here.

The practical takeaway is smaller than the scare version and more useful: keep the dated invoices. A service record showing an annual visit is what settles the argument if a claim is ever questioned, and it costs nothing to file the paperwork in the same drawer as the manual.

Do you need a tune-up or a repair call?

Two questions, and it tells you which visit to book, or whether to book anything at all.

This is a routing guide, not a diagnosis. Any work involving refrigerant or the electrical compartment belongs to a certified technician.

Frequently asked questions

What does air conditioning maintenance include?

A complete visit covers twelve checks: the filter, the outdoor condenser coil, the indoor evaporator coil, the condensate drain, refrigerant pressures, a leak check, the temperature split, electrical connections, the capacitor and contactor, compressor and fan amp draw, the blower wheel, and thermostat operation. Anything short of that is a partial visit.

How often should an air conditioner be serviced in Ontario?

Once a year, before the cooling season starts rather than during it. The filter is separate and runs on its own interval, which depends on filter thickness more than on the calendar. Booking in spring also means you are not competing with everyone else for a technician during the first heat wave.

Is air conditioning maintenance really necessary?

Yes, and Natural Resources Canada is direct about why: dirty filters, coils and fans reduce airflow, which decreases efficiency and capacity and can lead to expensive compressor damage if left for an extended period. The compressor is the costliest part in the system, so the annual visit is mostly insurance on that one component.

What happens if you never service your air conditioner?

It usually keeps running while quietly losing capacity, then fails during the first serious heat of the summer. Natural Resources Canada puts the life expectancy of a central air conditioner at 15 years or longer, and that figure assumes proper maintenance. Neglect tends to shorten it by killing the compressor early.

Can I do my own air conditioner maintenance?

You can change the filter, keep growth and leaves clear of the outdoor unit, and gently rinse the outdoor coil with the power off. You cannot legally touch the refrigerant: under O. Reg. 463/10 in Ontario, only a certified technician may remove, discharge, handle or dispose of it. Leave the electrical compartment alone as well.

Does skipping maintenance void an air conditioner warranty?

Not automatically. Carrier's residential limited warranty excludes failure or damage caused by improper servicing, so a failure traced to neglect can be refused, but unrelated faults generally are not. Registration matters more in practice: register within 90 days and the parts term is typically ten years, miss it and it falls back to five.

Final verdict

Air conditioning maintenance is worth booking once a year, but only the version that measures something. The twelve checks in Table 1 are what separates a visit that finds a failing capacitor or a slow leak from a visit that changes a filter and leaves a sticker. Ask any contractor which of the twelve their price covers, and ask for the readings afterwards. Those two questions do more for you than comparing prices.

Where we are not the best answer: if your system is already past fifteen years and losing capacity, a maintenance plan is money spent propping up equipment that is near the end of its service life. In that case the honest conversation is about replacement, and our page on when to replace an air conditioner in Ontario is a better starting point than a tune-up booking. We would rather tell you that than sell you a plan on a unit we expect to fail.

Sources and references

• Air Conditioning Your Home, Natural Resources Canada. Airflow and refrigerant mechanism, and the 15 years or longer service life. Read September 3, 2026.
• Certificate to handle refrigerants, Government of Ontario. Certification requirement and the ODP card. Read September 3, 2026.
• O. Reg. 463/10, Ozone Depleting Substances and Other Halocarbons, made under the Environmental Protection Act.
• Carrier residential warranty. Registration window and the improper servicing exclusion. Read September 3, 2026.

Mario Vaghei

General Manager, Aire One Peel Heating & Cooling

Mario built the twelve-point list on this page from what our technicians actually carry out on a maintenance call rather than from a marketing sheet, and made the call to delete the 15 to 20 per cent saving figure the earlier version quoted once it could not be traced to a source. He is General Manager, not a licensed refrigeration mechanic, so everything here about handling refrigerant stops at the line the Ontario certificate draws.