If you live in communities in Southwestern Ontario, particularly in Goderich, Lambton Shores, London, Exeter, and Strathroy, summers can be hot and extremely humid, while winters are bitterly cold. 

We can’t deny that Ontario leads the country in air conditioner usage (around 83–85% of households have AC), that’s why a reliable HVAC system isn’t just a luxury, it’s a necessity. 

But you can’t just own a furnace or central air unit and trust it will work on its own; you also need to take care of it.

Southwestern Ontario’s August air averages about 72% relative humidity, with July around 80% in London) means your AC works hard to keep you cool.

There are a few essential HVAC maintenance tips you can follow to stay comfortable, avoid expensive breakdowns, and even save on energy bills.

We’ve put together a comprehensive guide with the key things every homeowner should know about their HVAC system.

Let’s get started keeping your HVAC healthy and your home cozy (or cool)!

1. Change Your HVAC Filters Every 1–3 Months

Let’s keep it simple. One thing you cannot skip is implementing maintenance tasks, routinely changing or cleaning your HVAC air filters. 

If you have a clogged filter, you can’t imagine how it forces your system to work harder and use more energy to push air through. A dirty filter can reduce cooling efficiency and airflow. That’s why you can expect higher bills and even the risk of equipment damage if this persists. 

What you can do is replace disposable filters every 1–3 months. Clean washable or permanent filters according to the manufacturer’s instructions. 

Another thing to note is that if you have pets, smokers, or allergy sufferers, you may strictly need more frequent filter changes due to increased dust and debris.

2. Pay Attention to Unusual Noises, Smell, or Inconsistent Temperatures

Any HVAC system normally has a steady hum in the background. Unusual noises could sound like bangs, clanks, or rattles. 

If you hear any of them, don’t ignore them.

This is potentially your HVAC’s cry for help. You need to address it early so you can prevent a minor problem from turning into a major repair. 

Also, keep an eye on any temperature consistency. If you feel like there are uneven temperatures in certain vents, this can be your sign to check blocked ducts, failing blower fans, or low refrigerant.

3. Clean Your Outdoor A/C Condenser Regularly (Yes, Get the Hose Out!)

Your central air conditioners are exposed to elements outdoors all year round.

Over the fall and winter, leaves, snow, and other debris would accumulate around the condenser. Without you knowing it, they’re logging up the fins and coils that are essential for releasing heat. 

Make it a habit to ensure there’s adequate clearance around the condenser. This provides good airflow. Remove any leaves, twigs, or clutter that have gathered at the base. 

Shut off power to the A/C for safety (there’s usually a disconnect switch on the outside wall). Then, gently clean the condenser coils and fins. The easiest way is to use your garden hose: spray the fins with water (from the top downward at a slight angle) to wash away dirt and dust. 

Do NOT use a pressure washer or a nozzle with a hard jet setting; a gentle shower setting is best to avoid bending the delicate aluminum fins. 

By incorporating this task into your routine (for example, hosing off the unit whenever you’re watering the garden on hot days), you help the A/C “breathe” better. 

One homeowner in Lambton Shores mentioned they make it a habit to rinse the AC unit every time they mow the lawn in summer, a great reminder strategy!

4. Keep Vents and Return Air Grilles Free of Obstructions

It’s easy to overlook, but the placement of furniture and the general layout of your rooms can have a significant impact on your HVAC’s effectiveness. 

Walk through your home and take note of every supply vent (where warm or cool air blows out) and every return grille (usually larger vents where room air is drawn back into the system). Are any of them blocked by furniture, rugs, or curtains? 

Blocking vents disrupts the airflow balance in your HVAC system. With this, you’d notice certain rooms not getting enough heating/cooling. In many cases, this also forces your system’s blower fan to work harder against the pressure.

That’s why you make sure all vents are open and unobstructed.

According to Natural Resources Canada, for a forced-air heating/cooling system, you should keep return-air grilles and heat registers clean and clear of obstructions and change filters regularly for best performance.

Your HVAC system will thank you and your home will stay more consistently comfortable as a result.

5. Schedule Routine Professional HVAC Maintenance

Just like your car needs oil changes, your furnace and air conditioner need regular check-ups by an HVAC professional.

These preventive maintenance sessions are critical to extend the life of your HVAC equipment. Experts from Jayden’s Mechanical recommend having your cooling system serviced at least once a year and your heating system serviced once a year.

During a maintenance visit, a technician will perform tasks that go beyond the average homeowner’s scope: 

• Cleaning internal components (coils, burner, blower motor, drain lines),
• Checking refrigerant levels and looking for leaks,
• Testing electrical connections and controls,
• Lubricating moving parts

Studies show that regular HVAC check-ups can improve energy efficiency by 10–20%. One industry association found that yearly maintenance can reduce emergency repairs by up to 95%. Imagine avoiding 95% of the stress and cost of breakdowns just by keeping a routine service schedule! 

As Jayden Mechanical puts it: “Every summer we get calls from families in Southwestern Ontario with no cooling, and often it’s something that could’ve been caught with a preseason tune-up. It’s heartbreaking to see folks suffering in 30°C heat when a simple check could have saved them. That’s why we urge our customers: don’t skip your annual maintenance.”

6. Be Smart About Ventilation: Open Windows Sparingly on Humid Days

When it’s breezy outside, you might be tempted to open the windows instead of running the air conditioner. After all, fresh air is free.

Besides, if the outdoor conditions are right, it’s a good chance to ventilate your home. However, be cautious in Southern Ontario’s humid climate. Opening windows at the wrong time can actually increase your home’s humidity and make your A/C work harder in the long run.

Later, when you close the windows and start the AC back on, the system has to remove all that extra humidity from the air, which can take hours of runtime.

Experts generally advise keeping windows closed when outdoor humidity is above ~50–60%. However, summer humidity in Ontario is often well above that level with an average of 72% RH in August. Also, mornings can be 80–90% humid. (For example, London, ON sees ~80% average humidity in July.) 

The takeaway: choose your natural ventilation times wisely. If it’s sticky outside, you’re better off keeping the windows closed and maybe running the AC a little less if you want to save energy.

Summary

By following these tips, you can take control of your HVAC’s health!

These practices will reward you with lower energy bills, fewer repairs, better air quality, and a longer-lasting system. Most importantly, your family will enjoy a comfortable home environment no matter the season. 

If you’re in Southwestern Ontario, whether in Goderich, Lambton Shores, London, Exeter, Strathroy, or the surrounding areas, and you have questions about your HVAC system, we’re here for you. 

Jayden’s Mechanical is proud to serve our local communities with top-notch HVAC maintenance, repairs, and installations.

Contact Jayden’s Mechanical today to book your HVAC tune-up or repair and let us help keep your home comfortable year-round!

Common HVAC Questions

How often should I change my HVAC filter?
A good rule of thumb: check it once a month and change it every 1–3 months. If you’ve got pets, allergies, or live somewhere dusty, you might need to swap it out more often. A clean filter keeps air moving and helps your system work like it should.

Do I really need yearly HVAC maintenance?
Yep, you really do. Even if everything seems fine, a yearly check-up can catch small problems before they turn into big ones. 

Why are some rooms in my house hotter or colder than others?
Start with the simple stuff: make sure vents aren’t blocked by furniture and your filter isn’t clogged. If that doesn’t help, you might have airflow or ductwork issues. A professional can figure it out and help even things out.

Is it okay to open the windows on cool nights instead of running the AC?
Go for it! As long as the air outside is cool and dry. If it’s humid, you’ll just make your house feel sticky, and your AC will have to work harder later to fix it.

What should I do if my HVAC starts making weird noises or smells?
Turn it off and call a pro. Strange sounds or smells usually mean something’s wrong, it could be mechanical, mold, or even a gas leak. Best to get it checked sooner rather than later.

Any tips to help my AC run more efficiently in the summer?
Absolutely. Use a programmable thermostat, keep blinds closed during the hottest part of the day, and run ceiling fans to help you feel cooler.