TL;DR: If your HVAC system isn’t heating or cooling like it used to, the issue could be as simple as a clogged filter or as complex as a failing compressor. This post walks you through common causes, what you can check yourself, when to call a pro, and how to keep things running smoothly year-round in Guelph, Kitchener, Waterloo, and Cambridge.

When your home feels too cold in the winter or too hot in the summer, it’s easy to panic. Heating and cooling systems don’t just make life comfortable in Southern Ontario—they’re essential. If your HVAC system isn’t doing its job properly, there are a few likely culprits you can investigate before picking up the phone.

1. Start With the Basics: Filters & Thermostats

The first thing we tell homeowners in Guelph or Kitchener who call us with this issue? Check the air filter. A dirty or clogged filter restricts airflow and makes your system work harder than it should. Most filters need replacing every 1 to 3 months.

Next, make sure your thermostat settings are accurate. If it’s on "fan" instead of "auto," or if it’s set to the wrong temperature, it could be blowing air without heating or cooling it.

2. Electrical or Power Issues

Sometimes the problem is as simple as a tripped breaker or a blown fuse. Check your electrical panel and reset any tripped switches. Also, look outside—is the outdoor unit running? If it’s completely silent, it may not be getting power.

3. Dirty Coils or Blocked Outdoor Unit

Living in the Guelph-Waterloo region means dealing with a lot of seasonal debris. If your outdoor condenser unit is covered in leaves or dirt, it can’t exchange heat properly. Carefully hose it down or call a tech for a professional cleaning.

4. Low Refrigerant Levels

If your system is cooling poorly but still running, you could have low refrigerant due to a leak. This is something only a licensed HVAC technician should check and fix. Refrigerant issues are especially common in older units around Cambridge and surrounding areas.

5. Age & Wear and Tear

If your system is over 10-15 years old, its performance may simply be dropping due to age. HVAC units lose efficiency over time, especially if they haven’t been maintained annually. Repairs might help in the short term, but you could be throwing money at a unit that’s ready to retire.

When to Call in a Pro

If you’ve tried the easy fixes and your system still isn’t heating or cooling properly, it’s time to call a licensed HVAC technician. At B.A.P Heating & Cooling, we serve Guelph, Kitchener, Waterloo, Cambridge and surrounding areas with fast diagnostics and honest advice.

We can spot issues early, extend the life of your system, and help you avoid more expensive repairs down the road. Need financing for a new system? We’ve got options for that too.

Give us a call at (519) 835-4858 for a Free Quote!

What You Can Do Right Now:

• Replace your air filter if it looks grey or dusty

• Double check your thermostat settings

• Clear debris from around your outdoor unit

• Schedule seasonal maintenance (spring and fall are best)