When an Alberta heat wave rolls in, your air conditioner can quietly become the most expensive appliance in your house. The good news: a big chunk of a summer power bill is waste — cold air leaking away, a system straining against dirt, or a thermostat set lower than anyone actually needs. Here are ten practical, Edmonton-tested ways to keep your home comfortable this summer while spending less to do it.
1. Change Your Filter — Yes, Even In Summer
Your furnace filter still does its job in cooling season, because your central air conditioner pushes air through the same furnace and ductwork. A dirty, clogged filter chokes airflow and forces the system to run longer, using an estimated 5 to 15 percent more energy. Check it monthly through the summer and replace it when it looks grey. It is the cheapest efficiency upgrade you can make, and it protects the equipment too.
2. Keep The Indoor Coil And Ducts Clean
Behind your filter sits the evaporator coil — the cold coil that actually removes heat from your air. When dust builds up on it, it acts like a blanket, and a fouled coil can push energy use up by 20 to 40 percent while cooling your home less. Dirty ductwork adds resistance on top of that. Keeping the coil and ducts clean is one of the highest-value things you can do for summer efficiency, and it is a core part of what we do.
3. Rinse Off The Outdoor Unit
The condenser unit outside dumps your home's heat into the air, and it can't do that if it's caked in cottonwood fluff, grass clippings and dust — all of which Alberta summers produce in abundance. With the power off, gently rinse the fins with a garden hose from the inside out, and keep at least 60 cm (two feet) of clear space around all sides so it can breathe.
4. Set The Thermostat Smarter
Natural Resources Canada recommends about 25.5°C when you're home and active in summer, and turning it up toward 28°C when the house will be empty for more than a few hours. Every degree you cool below what you actually need adds cost, so nudging the setpoint up even one or two degrees is real money over a hot month.
The single biggest lever: don't cool an empty house. Letting the temperature drift up while you're at work and cooling back down when you return costs far less than holding one cold temperature all day. A programmable or smart thermostat does this automatically so you never have to think about it.
5. Use Ceiling Fans The Right Way
Moving air makes your skin feel cooler, which lets you raise the thermostat a few degrees without feeling any warmer. Run ceiling fans counter-clockwise in summer. One caution from Natural Resources Canada: fans cool people, not rooms, and the motor actually adds a little heat — so turn them off when you leave the room, or you're just paying twice.
6. Block The Sun During The Day
Sunlight pouring through south- and west-facing windows can heat a room like a greenhouse and make your AC work overtime. Close blinds and curtains on the sunny side during the hottest part of the day. Light-blocking or reflective window coverings make a noticeable difference during a heat wave.
7. Seal The Leaks Where Cool Air Escapes
The cool air you paid for slips out through the same gaps that let winter drafts in — around doors, windows, and where wiring and plumbing enter the house. Weatherstripping and caulking are inexpensive, and they cut your cooling bill in summer and your heating bill in winter.
8. Move Heat-Making Chores To The Evening
Ovens, stovetops, dishwashers and clothes dryers all dump heat and humidity into your home. Run them in the cooler evening hours, use the barbecue instead of the oven, and your air conditioner won't have to fight your appliances all afternoon.
9. Don't Over-Close Your Vents
Shutting a few vents in unused rooms sounds efficient, but closing too many raises pressure in your ducts, which can reduce airflow, freeze the coil and make the whole system work harder. Leave most vents open and let the system breathe the way it was designed to.
10. Book A Seasonal Tune-Up
A professional who cleans the coil, checks airflow and confirms the system is moving air freely will catch the small problems that quietly inflate your bill. Pair that with clean ducts and a fresh filter and you've addressed the biggest, most common sources of cooling waste in an Alberta home.
Why This Adds Up In Alberta
Our summers are short but they spike hot, and cooling equipment often sits unused for months, collecting dust before it's suddenly running flat-out during a heat wave. That's exactly when a dirty coil, a clogged filter or an over-set thermostat costs the most. A few small habits — and a clean system — keep more of your money where it belongs. For a deeper walkthrough, see our guide to summer AC maintenance for Alberta homes.
Quick Answers
Should I change my furnace filter in summer?
Yes. Your central air conditioner pushes air through the same furnace and ductwork, so a dirty filter chokes airflow and makes the system run longer — using roughly 5 to 15 percent more energy. Check the filter monthly through the cooling season and replace it when it looks grey or clogged.
What temperature should I set my AC to in the summer?
Natural Resources Canada recommends about 25.5°C when you are home and active, and turning the thermostat up toward 28°C when the house will be empty for more than a few hours. Every degree cooler than you actually need adds cost, so raising the setpoint even one or two degrees saves money over a hot month.
Can a dirty air conditioner really raise my power bill?
Significantly. Dust on the indoor evaporator coil acts like insulation and can increase energy use by 20 to 40 percent while cooling your home less, and a clogged filter adds another 5 to 15 percent. Keeping the coil, filter and ducts clean is one of the highest-value ways to lower a summer cooling bill.
Do ceiling fans lower cooling costs?
They can, if you use them right. Moving air makes your skin feel cooler, letting you raise the thermostat a few degrees without feeling warmer. But fans cool people, not rooms, and the motor adds a little heat — so turn them off when you leave the room, otherwise you are paying to run the fan and to remove its heat.
Is it cheaper to leave the AC on all day or turn it up when I'm out?
For most homes it is cheaper to let the temperature drift up while you're away and cool back down when you return, rather than holding one cold temperature all day. A programmable or smart thermostat does this automatically, which is why it is one of the most effective changes you can make.
Should I close vents in unused rooms to save money?
Closing a few vents is usually fine, but closing too many raises pressure in your ductwork, which reduces airflow, makes the system work harder and can even freeze the coil. Leave most vents open so the system can move air the way it was designed to.
Trusted Sources
Every figure above is drawn from Canadian building-code authorities, government agencies and established industry safety guidance. Start here to dig deeper.
Natural Resources Canada – ENERGY STAR
Canada's official guidance on cooling your home efficiently, choosing equipment and setting your thermostat for summer.
Read the guideNRCan – Keeping the Heat In (Sec. 9)
Government of Canada detail on operating thermostats, fans and cooling systems, including the recommended summer setpoints.
See the detailsU.S. Department of Energy
How filter, coil and airflow maintenance affect your air conditioner's efficiency and running cost.
Maintenance basicsENERGY STAR
Independent efficiency benchmarks for heating and cooling equipment and the maintenance that keeps it running well.
Explore ENERGY STARA Cleaner System Is A Cheaper System
Dirty ducts and a fouled indoor coil are two of the biggest hidden reasons an Alberta home costs more to cool than it should. Home Pros Group has cleaned furnaces, ductwork and A/C coils across Spruce Grove, Stony Plain and the Greater Edmonton Area since 2003 — helping your system move cold air freely instead of fighting for it. Ask us for a free quote.
This article is general information about home cooling and energy use, not a guarantee of specific savings, which vary by home, equipment and electricity rates. Guidance and figures are summarized from Natural Resources Canada, the U.S. Department of Energy and ENERGY STAR. Always cut power before cleaning any electrical equipment. Home Pros Group provides furnace, duct and A/C coil cleaning; we do not repair refrigerant systems — for those, call a licensed HVAC technician.