Macdonald Mechanical | Kelowna HVAC company

How to Keep Your Home Cool This Summer Without Spiking Your Energy Bill

Comfortable Okanagan home in summer — ceiling fan, drawn blinds, and smart thermostat keeping energy costs low

Okanagan summers are something else. By late June, daytime temperatures regularly push past 35°C, and your air conditioner goes from an occasional comfort to an around-the-clock necessity. That's when energy bills start climbing — and for a lot of homeowners, the increase feels unavoidable.

It doesn't have to be. With a few simple habits and a well-maintained system, you can stay comfortable all summer without your electricity bill getting out of hand.

Set Your Thermostat Wisely

Your thermostat setting has a bigger impact on your energy costs than almost anything else. A common mistake is cranking it down when you get home on a hot day — the idea being that it'll cool faster. It won't. Your AC delivers air at the same temperature regardless of the setpoint, so a lower number just means it runs longer.

A few guidelines that actually help:

Set it and leave it. Constant adjustments make your system work harder. Find a comfortable temperature — most households land between 22°C and 25°C — and stick with it.
Raise it when you're away. If the house is empty for hours, there's no reason to keep it at your usual comfort level. A few degrees higher while you're out makes a meaningful difference over a month.
Use a programmable or smart thermostat. These take the guesswork out of it entirely. You set a schedule once, and your home is cool when you arrive and efficient when you're not there.

Use Your Fans the Right Way

Ceiling fans don't actually cool the air — they create a wind chill effect that makes the air feel cooler. That distinction matters, because it means fans are most useful when you're in the room. Running a ceiling fan in an empty room just wastes electricity.

When your fans are working with your AC:

Set ceiling fans to run counter-clockwise in summer. This pushes air straight down, which is what creates the cooling effect. Most fans have a small switch on the motor housing to change the direction.
You can raise your thermostat by about 2°C when using ceiling fans and feel equally comfortable — that difference adds up over a full summer.
Use exhaust fans in kitchens and bathrooms when cooking or showering. Heat and humidity are your AC's two biggest challenges, and removing both at the source makes a real difference.

Manage Your Windows and Sunlight

Windows are where a significant amount of summer heat enters your home. South and west-facing windows in particular take in direct afternoon sun, which can raise indoor temperatures quickly — and make your AC work much harder.

Simple habits that help:

Close blinds and curtains on sun-facing windows during the hottest part of the day (roughly noon to 6 PM). Blackout curtains or cellular shades are especially effective.
Open windows in the evening when outdoor temperatures drop. In the Okanagan, nights often cool down considerably. If it's cooler outside than inside, turn off the AC and let natural ventilation do the work.
Be cautious with opening doors and windows during the day. Letting in hot air mid-afternoon undoes a lot of what your AC has already accomplished.

Reduce the Heat You're Generating Inside

Your AC isn't just fighting the outdoor heat — it's also dealing with everything inside your home that generates warmth. Appliances, cooking, lighting, and electronics all add to the heat load your system has to manage.

Small adjustments that add up:

Cook in the morning or evening when it's cooler, or use a BBQ or slow cooker instead of your oven on the hottest days.
Switch to LED lighting if you haven't already — incandescent bulbs generate a surprising amount of heat.
Run your dishwasher and dryer at night when ambient temperatures are lower.
Unplug electronics and chargers when not in use. Devices in standby mode still generate heat.

Keep Your AC System Maintained

None of the above tips work as well if your AC system isn't running efficiently. A well-maintained system cools your home faster, more evenly, and at a lower cost. A neglected one works harder, runs longer, and still struggles to keep up.

The most important things you can do:

Change or clean your air filter regularly. A clogged filter restricts airflow, which forces your system to work harder and can cause it to overheat. During summer months when your AC runs daily, check the filter every 4–6 weeks.

Keep your outdoor unit clear. Your condenser unit needs good airflow to release heat. Trim back any plants or shrubs that have grown close to it, and rinse off the fins with a garden hose if they're dusty — which is common in the Okanagan's dry summers.

Don't block your indoor vents. Furniture, rugs, and curtains placed over vents significantly reduce airflow and make certain rooms harder to cool. Walk through your home and check that all supply and return vents are unobstructed.

Book a professional tune-up if you haven't this season. Even if your system seems to be running fine, a seasonal check catches small inefficiencies that cost you money all summer long. If you had your system looked at in the spring, you're already ahead.

A Comfortable Summer Doesn't Have to Be an Expensive One

The Okanagan heat isn't going anywhere — but your energy costs don't have to spike just because the temperature does. A combination of smart habits, a few simple home adjustments, and a properly maintained AC system gives you the best of both: a cool home and a manageable bill.

If your system hasn't been serviced this year, or if you've noticed it working harder than usual, it's worth getting ahead of it before the real heat arrives. A quick check now is far less disruptive than an emergency call in the middle of a heat wave.

Macdonald Mechanical serves residential customers throughout the Okanagan. Whether you need a seasonal tune-up or have a concern about your system's performance, we're here to help.