How to improve air conditioning in Calgary

Clean or replace your filters every 30 to 45 days during peak usage. It’s not just about airflow – clogged filters force the system to work harder, draw more power, and wear out faster. In one home we checked in the southeast last month, a $12 filter swap shaved 14% off the monthly electricity bill. That’s not rare. Neglect here usually costs more than people expect.
Another common culprit? Leaky ductwork. In older homes, especially those built before 1990, gaps or loose seals in the ducting can let up to 30% of cooled air escape into walls or crawlspaces. Not only does that reduce comfort, but it also means the equipment is cooling areas no one lives in. A quick pressure test by a technician can pinpoint issues, and sealing them is often a one-time fix that pays off year after year.
Don’t overlook the thermostat. If yours is more than 8–10 years old, even if it still “works,” it’s probably wasting energy. Modern programmable or smart models can reduce runtime without sacrificing comfort. One client in the northwest suburbs reported their runtime dropped by over an hour per day after installing a newer unit – same settings, different results.
Timing your usage also helps. Try pre-cooling your home early in the morning, before outdoor temperatures climb. Once the house holds that lower baseline, it takes less work to maintain it. Yes, that’s more of a manual strategy, but it’s surprisingly effective in homes with decent insulation. It’s worth experimenting with for a week or two.
Lastly, check the outdoor unit. If it’s surrounded by tall grass, leaves, or fencing within a foot, it can’t “breathe” properly. Give it at least 24 inches of clearance. And if the coils look dusty or oily, it might be time for a cleaning – professionally, not just hosing it down. Grime buildup can raise operating temperature and push up energy use by 10% or more, even on cooler days.
Choosing the Right AC Unit Size for Calgary’s Climate
Go too small, and the system runs constantly, struggling to keep up. Oversize it, and it short-cycles–turning on and off more often than it should. Either way, you’re wasting energy, money, and probably patience. For this region, the sweet spot usually falls between 20 to 25 BTUs per square foot, depending on insulation and window exposure.
For example, a 1,600 sq ft home with decent insulation might do well with a 36,000 BTU (or 3-ton) unit. But if there’s a lot of south-facing glass or an older roof, bumping it up to 40,000 BTU might make more sense. And don’t forget the altitude. At over 1,000 meters, thinner air slightly reduces heat transfer efficiency. It’s subtle, but noticeable over time–especially on those rare 30°C days that seem to hit all at once.
Don’t Trust Square Footage Alone
Two houses can be the same size and need completely different cooling loads. Basement layout, roof pitch, tree cover–all of it matters. I’ve seen newer builds with spray foam insulation need almost a full ton less than an older bungalow with leaky windows. A manual J calculation is the gold standard here. It’s math-heavy and kind of boring, but accurate.
What Usually Gets Missed
People forget about appliance heat. An open-concept kitchen with two ovens running in July? That needs more capacity than the same house with just a microwave and toaster. Same goes for occupancy–four people generate more body heat than one. Not a massive difference, but enough to sway things if you’re between sizes.
If you’re stuck between a 2.5-ton and a 3-ton unit, and there’s no clear answer, lean toward the slightly larger option–but only if humidity control isn’t a huge concern. Otherwise, the smaller unit might dehumidify better, even if it runs longer.
Maintaining Air Filters and Ducts to Optimize Cooling

Replace pleated filters every 60–90 days. If you’ve got pets or allergies, cut that to about 30–45. A clogged filter forces your unit to work harder, and that extra strain? It eats up energy and shortens system life. A quick visual check once a month helps catch buildup early. If the filter looks grey or patchy, swap it–don’t wait.
Use MERV 8–11 filters for most homes. Higher-rated ones trap more particles but can restrict airflow if your system isn’t built for it. Not every setup needs hospital-grade filtration, and sometimes, trying too hard there just backfires.
As for ducts–if airflow feels weak in one room but fine in others, that’s a red flag. Leaks, blockages, or crushed sections might be behind it. Sealing joints with foil-backed tape (not cloth duct tape–it degrades fast) and adding insulation to attic runs can cut thermal loss by up to 30%. Sounds high, but the numbers hold up.
Don’t ignore dust rings around registers or musty smells. Those hint at deeper buildup inside. Professional duct cleaning every five to seven years is usually enough, unless you’ve had renovations or pests–then sooner makes sense. Just make sure the company uses negative pressure equipment and doesn’t upsell extra sanitizers unless you’ve got a valid concern like mould.
Quick personal note–after sealing a few leaks in our own basement ductwork last fall, the airflow upstairs jumped noticeably. Not a massive project, but honestly, the comfort difference? Pretty decent for a weekend’s effort.
Adjusting Thermostat Settings for Calgary’s Temperature Swings
Set your thermostat to 23°C during the day when someone’s home. That seems to be the sweet spot – not too warm, not too chilly. At night, or when the house is empty, drop it down to 18°C. That 5-degree shift can noticeably lower electricity use without making anyone miserable.
Some people push it further and go as low as 16°C at night. That works if you’ve got warm bedding and don’t mind a brisk wake-up. Personally, anything below 18°C and I’m wrapped in two blankets wondering if I forgot to close a window.
Rapid weather shifts are common – one hour it’s sunny, the next there’s hail. Smart thermostats help a lot here. They can learn your schedule and adjust automatically. But if you’re not using one, at least check the forecast daily and tweak settings ahead of time. If it’s going to drop 10 degrees by evening, don’t wait for the house to turn into a fridge before reacting.
Avoid constantly changing the temperature throughout the day. That back-and-forth forces your system to work harder than necessary. One or two adjustments a day is enough. Stability helps more than you’d think.
Finally, consider using the fan setting on its own during mild temperature dips. Sometimes just moving the air around is enough, especially during those weird in-between hours where it’s not hot or cold – just sort of… stale.
Contact “Calgary Air Heating and Cooling Ltd” For More Information:
Address
95 Beaconsfield Rise NW, Calgary, AB T3K 1X3
Phone
+1 403 720-0003
Hours of operation
Open 24 hours 7 days a week