When the Ontario summer heat rolls in, there's nothing worse than flipping on your air conditioner and realizing… something's not right. Maybe the air feels warm, maybe it's not kicking in at all, or maybe it's making a sound that's just plain concerning. The good news? A lot of these problems are preventable.

It’s not the most glamorous part of your system, but your air filter is your first line of defense. A clogged or dirty filter makes your AC work harder than it needs to, which can lead to higher energy bills, poor airflow, and even system failure. In Ontario, where pollen and construction dust are regular summer guests, you should be checking that filter at least once a month.

If you have pets or you’ve had your windows open a lot this season, check even sooner.

Sometimes, your AC isn’t the problem—your thermostat is. Whether it’s out of calibration or just installed in a spot that gets too much sunlight, it could be giving your AC bad information. That means your system could short cycle, run at the wrong time, or not kick in at all. If things seem off, start here before assuming the whole system is down.

(And yes, double-check that it’s set to “cool.” You’d be surprised how often we see that.)

If your system isn’t cooling properly, low refrigerant could be to blame. But refrigerant doesn’t just “run out”—if it’s low, there’s probably a leak. And that’s something you don’t want to ignore.

Not only does a leak affect your comfort and energy efficiency, it can damage the environment. In Ontario, technicians are required to handle refrigerants safely and responsibly. So if you’re noticing poor cooling or ice buildup on the outdoor unit, it’s time to call a licensed pro. 

Ontario summers can be lush—and that means your outdoor AC unit might be surrounded by grass, weeds, or even mulch from your garden. When airflow gets blocked, performance drops fast. Make sure there’s at least two feet of clearance around the unit and hose it down gently if you see debris or dust buildup. 

Also: avoid storing anything against the unit. We’ve seen everything from lawn chairs to hockey nets leaning up against condensers.

Humidity is no joke in Ontario, and if your condensate drain gets clogged, you could be looking at water damage—fast. Likewise, frequent power fluctuations or tripped breakers can cause electrical components to corrode or short out. 

If your unit shuts off randomly or you see water pooling around it, shut it down and give us a call. These issues are easy to fix early, but costly if left too long.