Air Conditioner Repair in Durham Region: 7 Common Problems and When to Call HVAC Zack
Even as summer winds down, plenty of homes across Durham Region are still relying on their air conditioners to stay cool and comfortable. But what do you do when your AC isn’t working properly?
Maybe it’s blowing warm air. Maybe it’s making a strange noise. Or maybe it just won’t turn on.
That’s where HVAC Zack comes in.
We help homeowners throughout Oshawa, Whitby, Ajax, Pickering, Courtice, and Bowmanville with quick, professional air conditioner repairs that get things back to normal without the hassle.
So what’s actually wrong with your system—and how do you know when it’s time to call?
Signs Your AC Might Need Repairs
It’s not always obvious when your air conditioner is struggling. Sometimes the signs are subtle. Maybe your energy bill has gone up. Maybe the system seems like it’s running harder than it used to. Or maybe your home just doesn’t cool down the way it should.
Other times, the symptoms are more noticeable. Warm air coming from the vents, water leaking near the unit, or a loud buzzing sound that wasn’t there last week can all signal that something’s off.
If you’re unsure, it’s always better to check before a small issue turns into a complete breakdown.
The Most Common AC Problems in Durham Homes
Every summer, we get calls from homeowners dealing with the same types of issues. Some are simple and easy to fix. Others require a deeper look and some skilled troubleshooting. In a lot of cases, airflow is the problem. A dirty filter can lead to frozen coils and poor performance.
Low refrigerant is another common one—it usually shows up as weak cooling or warm air from the vents. Sometimes it’s a thermostat that’s not talking to the unit properly, or a capacitor that’s burned out.
Electrical issues, frozen evaporator coils, clogged drains, and water leaks also pop up pretty regularly. These aren’t just annoyances—they can lead to real damage if left alone too long.
And then there are the “nothing’s working” calls. The kind where your thermostat looks fine, but the AC is totally unresponsive. That’s when it’s time to stop guessing and bring in a pro.
Not Sure If It’s Serious? Here's When to Call HVAC Zack
We’re not here to upsell or overcomplicate things. In fact, we’re often the ones who tell customers, “You’re okay for now.”
But there are definitely some situations where it’s smart to book a service call. If your AC is blowing warm air, making new or unusual noises, turning on and off too frequently, or refusing to start at all, don’t wait.
Same goes for things like leaks, ice buildup on the unit, a thermostat that isn’t responding, or rooms that aren’t cooling evenly. If it’s affecting your comfort—or your peace of mind—it’s worth getting checked.
Need a second opinion?
See our AC repair services
We’re Based in Durham, and We Know These Systems
HVAC Zack isn’t a call centre or a franchise. We’re local. Based right here in Durham Region, we’ve worked on everything from older central ACs to modern high-efficiency systems.
We’ve helped families in Oshawa, Whitby, Ajax, Pickering, Courtice, and Bowmanville get honest, professional repairs without the runaround. If something needs fixing, we’ll fix it. If it doesn’t, we’ll explain what’s going on and leave it at that.
We work with homeowners, landlords, and custom home builders, and we’ve built a reputation for doing things right the first time.
Let’s Fix It Before It Gets Worse
The best time to repair your AC is before the next heatwave or system failure. If something seems off, now’s the moment to deal with it. It could be a 10-minute fix—or it could prevent a much bigger issue down the road.
Ready to get started? Request service here.
You’ll speak directly with HVAC Zack.