Every July, the same thing happens in homes across Edmonton: the power bill climbs, someone decides the air conditioner is the villain, and the family spends the month quietly sweating instead of switching anything off. It does not have to be that way. Knowing how to lower your electric bill in summer comes down to three levers, and only two of them involve your air conditioner at all.
I have read through hundreds of comments from people who faced a 300 dollar summer jump, plus every major guide published on this topic, and the advice keeps circling back to the same physics. Air conditioning moves heat rather than creating cold, so every unit of heat that sneaks in through sun-lit glass, gaps in the ductwork, or a clogged filter gets paid for twice. Block that heat, run the system less, and shift the rest of your usage to cheap hours.
Below is a ranked plan. The top ten work are the ones that move the number fastest, and every one of them is free or nearly free.
Table of Contents
- Fastest Ways to Lower Your Electric Bill in Summer Right Now
- Why Your Summer Electric Bill Spikes: the Three Levers
- Set Your Thermostat the Right Way
- Block the Sun and Trap the Cool Air
- Run Your Appliances at the Right Time
- Keep the Air Conditioner Itself Efficient
- Use Fans So You Can Raise the Thermostat
- Appliances That Silently Spike Your Summer Bill
- Renter and Apartment Strategies
- Keeping Babies, Kids and Older Adults Cool Safely
- Ask Your Utility for Help Before You Spend Anything
- What to Buy, Tiered by What It Costs
- Myths That Cost You Money
- Turn Your Bill Into a Month-Over-Month Scorecard
- Frequently Asked Questions
- What runs up your electric bill the most?
- What is the simple trick to cut your electric bill?
- Is it cheaper to run AC all day or just at night?
- Why is my electric bill so high during summer?
- How do I keep my electric bill low with electric heat?
- Is 72 a good temperature for AC in the summer?
- How do I save on AC bills during summer?
- Should I close the vents in rooms I am not using?
- What can I do in a rental apartment to cut cooling costs?
- Is duct sealing worth the cost?
- Your 30-Day Plan to a Lower Summer Electric Bill
Fastest Ways to Lower Your Electric Bill in Summer Right Now
If you only have twenty minutes today, do these in order. Each one has a number attached so you can tell whether it worked.
- Set the thermostat to 78°F (26°C). Every degree you raise the setpoint cuts roughly 3 to 6 percent of cooling energy.
- Set back 7 to 10°F for 8 hours a day. The U.S. Department of Energy puts the annual saving at up to 10 percent.
- Clean or replace the air filter now. A dirty filter costs you 5 to 15 percent in efficiency. This is the single most-skipped task in the whole list.
- Close blinds and curtains on sun-facing windows by mid-morning. About 76 percent of sunlight striking a double-pane window ends up as heat indoors.
- Run ceiling fans counter-clockwise. Fans cool people, not rooms, so you can raise the thermostat 3 to 4°F and still feel fine.
- Shift laundry, dishwashing and the oven to off-peak hours. On a time-of-use plan, running them before the evening peak moves real money.
- Turn the water heater down to 120°F (49°C). Water heating is roughly 18 percent of a home’s energy use and most of that is wasted on scalding-hot water.
- Kill phantom loads with switched power strips. Chargers, TVs and game consoles in standby quietly add up across a whole season.
- Give the outdoor condenser 24 inches of clear space. A shaded condenser can run about 10 percent more efficiently than one crammed against a wall.
- Check the bill’s kWh line against last year, not just the total. A rate change and a usage change look identical until you separate them.
Here is the same set of moves ranked by how much they actually return for the time and money you spend.
| Action | Estimated savings | Cost | Effort | DIY or pro |
|---|---|---|---|---|
| Raise setpoint to 78°F | 3-6% per degree | None | One minute | DIY |
| Overnight or workday setback | Up to 10% annually | None | Ten minutes, once | DIY |
| Clean or change the filter | 5-15% | Minimal | Ten minutes | DIY |
| Close blinds on sun-facing glass | Noticeable indoor temperature drop | None | Daily habit | DIY |
| Ceiling fans at high speed | Lets you raise the setpoint 3-4°F | None | One switch | DIY |
| Shift usage off-peak | Varies by rate plan | None | Habit change | DIY |
| Water heater to 120°F | Trims the largest non-cooling load | None | Five minutes | DIY |
| Switched power strips | Varies by household | Low one-time | One afternoon | DIY |
| Seal ducts and attic penetrations | Up to 20% efficiency gain | Low to mid | A full weekend | DIY or pro |
| Annual service and coil cleaning | Protects efficiency you already paid for | Mid | Half a day | Pro |
Why Your Summer Electric Bill Spikes: the Three Levers
Your utility does not bill you for “air conditioning.” It bills you for kilowatt-hours, and the total on your invoice is three separate things multiplied together: how many kWh you used, what you pay per kWh, and when you used them.
The first lever is volume. Residential cooling is frequently 40 to 50 percent of a summer bill once you add up the air conditioner, the dehumidifier, the fans and the fridge working harder against warm kitchen air. That is the lever almost every tip in this article pulls.
The second lever is the price per kWh, which your utility can change between seasons or as your usage pattern changes. The same household running the same appliances can see the total climb while the kWh line stays flat. Energy Information Administration data shows residential rates have moved a lot over the past few years, and that movement is invisible unless you look at the rate column.
The third lever is timing. On a time-of-use plan, the kilowatt-hour you use at 5 p.m. on a July weekday can cost several times what the same kilowatt-hour costs at 2 a.m. The Energy Information Administration estimates something in the range of 5 to 15 percent of a summer bill is pure timing, which is free money once you know your peak window.
Pull the wrong lever and you work twice as hard for nothing. That is why step one of any real plan is reading your own invoice before changing anything.
Set Your Thermostat the Right Way
78°F is the number the U.S. Department of Energy lands on, and it is a starting point rather than a rule. A household with a baby, an older adult, or anyone on temperature-sensitive medication may need the setpoint lower, and that is a comfort and health trade-off, not a budgeting failure.
There is a difference between raising the setpoint and a setback. Raising it is simply picking a number you can live with. A setback is dropping the number 7 to 10°F for eight hours while the house is empty or asleep, then letting it recover. The eight hours is the part that matters; without duration, a setback is just a lower setpoint.
A smart thermostat only helps if it is actually wired to your system. Many systems installed in the last decade have a C-wire for exactly this reason, and models that need one will refuse to operate without it. Verify compatibility before buying anything, and check whether your system is one that a smart device can control at all.
Reaching for the coldest setting and then coasting is the most expensive habit on this page. Your compressor runs at one speed, so setting the thermostat to 60°F does not buy a colder burst of air, it buys extra hours of runtime. Experienced commenters in r/homeowners and r/CorpusChristi threads reach the same conclusion independently.
Block the Sun and Trap the Cool Air
Solar heat gain is the cheapest thing on this list to fix and the most overlooked. Blinds, curtains or cellular shades closed before the sun hits a west-facing window can drop indoor temperature several degrees by late afternoon, and a single western window will undo a lot of thermostat discipline.
The second job is stopping the cool air you already paid for from escaping. Door sweeps under exterior doors, weatherstripping around window and door frames, and a bead of caulk along exterior trim are all weekend jobs with immediate results. The same weekend is a good moment to check the attic hatch seal and the bathroom and kitchen exhaust vents, which should run to the outside rather than into the attic.
Attic insulation matters here in Edmonton. A great deal of summer heat arrives through the roof, and ventilation that works with a high level of insulation does a much better job than ventilation alone.
Run Your Appliances at the Right Time
Shifting when you run a load is the easiest saving on this page because it costs nothing and takes no equipment. The trick is knowing your utility’s peak window, which is usually late afternoon into early evening on summer weekdays.
Run the dishwasher and the washing machine after dinner or overnight, batch laundry into full loads, and use the grill or a side burner instead of heating the kitchen with the oven. Line-drying gets repeated in r/Frugal threads as a real win, though summer sun fades fabric, so a mix of line and dryer usually works best.
| Appliance | When to run it | Why it helps |
|---|---|---|
| Washing machine and dryer | Overnight or late morning | Avoids the peak window and lets lines dry |
| Dishwasher | After dinner, on the cooler cycle | Long run, no need to be in peak hours |
| Oven | Off-peak, or not at all | Adds several hours of kitchen heat indoors |
| Water heater | Drop the tank to 120°F | Removes standby heat loss and hotter draws |
| EV charging | Overnight | Full battery by morning without peak rates |
| Pool pump | Early morning, shorter runs | Long runtimes that stop entirely cost the most |
And turn off the two things you stopped thinking about years ago: the old television in the guest room and the garage freezer’s extra chest unit. Both are cheap to forget and expensive to keep.
Keep the Air Conditioner Itself Efficient
A cooling system that cannot move air is a cooling system that is burning electricity to do nothing. Replace or clean the filter every one to two months during cooling season, which ENERGY STAR puts at a 5 to 15 percent efficiency difference.
Beyond the filter, keep the condenser coil clear of grass clippings and cottonwood fluff, which matters more than almost anything else in an Alberta summer. Ensure the outdoor unit discharges to open air rather than into a tight corner or a side yard.
Ductwork is the quiet one. ENERGY STAR notes that roughly 20 to 30 percent of the air moving through a typical duct system never reaches the rooms it is meant to heat or cool, and sealing those leaks can improve system efficiency by up to 20 percent. Mastic, foil tape and a foam cannon cover most of it.
A professional tune-up before the first hot week is worth scheduling, but so is knowing when not to. If the system cools, blows air and drains properly, a mid-season emergency visit is an expense, not a saving.
Use Fans So You Can Raise the Thermostat
A ceiling fan does not lower air temperature. It moves air across your skin, and moving air over moisture on your skin evaporates it faster, which reads as roughly 4°F of cooling. That comfort you can buy back in thermostat degrees.
Run ceiling fans counter-clockwise at medium or high speed in summer, and leave them running. A big fan moves a few dozen watts; a central air conditioner’s compressor draws a small multiple of that and adds the heat from the compressor itself to the house. The ratio is the reason homeowners in r/Frugal threads describe fan use as nearly free next to cooling.
Cross-ventilation is the upgrade version: open windows on two sides of the house when the outdoor air is cooler than the indoor air, and place a fan to pull air through. Early morning and late evening are the reliable windows for it in a heat wave.
Appliances That Silently Spike Your Summer Bill
Cooling gets the blame, but a surprising share of a summer bill comes from devices nobody thinks of as part of the problem.
| Device | Why it costs you in summer | What to do |
|---|---|---|
| Dehumidifier | Runs continuously and produces heat | Set a humidity target, empty the tank, run it only when the AC is off |
| Pool pump | Long summer runtimes every single day | Shorten the run time rather than stopping and starting |
| Second fridge or chest freezer | Works harder as kitchen air warms | Keep it in the coolest, least sunny room, leave a gap behind it |
| EV charging | A full charge is a large block of energy | Schedule charging overnight off-peak |
| Space heater left on | Adds thousands of watts of resistance heat | Check for one still running in a closet or spare room |
| Phantom and standby loads | Draws small amounts of standby power 24 hours a day | Switched power strips for chargers, TVs and consoles |
Dehumidifiers deserve their own note because they are the one device that makes the house warmer while making it feel better. If your air conditioner handles humidity, running both at once is paying twice for the same comfort.
Renter and Apartment Strategies
If you rent, most of the expensive advice is simply unavailable to you. No attic access, no exterior caulking, no duct sealing, no replacing the window unit. That leaves fewer levers, but the remaining ones are real.
Start with the window unit itself. An oversized unit cycles on and off, wastes energy and cools unevenly, so a slightly undersized unit running steadily costs less. Keep the filter clean, and if the landlord permits it, shade the outdoor side with a rigid cover that does not touch the chassis.
Inside, a room-specific strategy works better than trying to cool the whole unit. Close doors to unused rooms, use a box fan to push air out of a warmer room so the unit’s cool air spreads further, and put a blackout curtain on the window the unit sits under.
Shared meters deserve a separate conversation. If your building allocates by square footage or splits a master meter three ways, the cooling choices of your neighbours land in your total. Ask your landlord in writing for the allocation method, and check what the building is doing about the shared chiller or rooftop units, since that is where many of the savings live.
Keeping Babies, Kids and Older Adults Cool Safely
This is where without sweating stops being about comfort. Households with infants, small children, older adults, or anyone with a medical condition tied to temperature should treat cooling as a health requirement, not a discretionary setting, and spend the money or run the system longer rather than rationing it.
For a baby’s room, aim for a cool, stable temperature and light sleepwear, and check on the child rather than relying on a hallway thermostat several rooms away. A small fan moving air in the room is often more useful than a low thermostat setting, and it lets the rest of the house stay warmer.
Medications and some medical supplies have storage temperature limits. If a household relies on powered medical equipment, include it in any power-saving plan and treat outages as medical emergencies, not billing inconveniences.
Know the local heat warning thresholds and check on neighbours, particularly older adults living alone. A cooling centre, a library or a community centre is a better outcome than a slightly lower utility bill.
Ask Your Utility for Help Before You Spend Anything
Most people on this page never call their utility, and utilities would rather help you than have you replace a working system.
Ask about the current rate plan first, including whether a time-of-use plan fits how your household actually uses power. A home that is empty all day benefits; a household that is home all day may not. Ask about demand response and peak alerts, which many providers offer at no cost. Ask about rebates on filters, smart thermostats and high-efficiency equipment, and ask whether they run or partner with an energy audit.
Assistance programs exist for households struggling to pay, and in the United States they run through state energy assistance agencies. In Alberta, low-income household energy support and weatherization programs are the equivalent, and municipal or regional offices can point you to what applies locally.
What to Buy, Tiered by What It Costs
Only start spending once the free layer is exhausted. Here is the order I would work through.
- Nothing. Thermostat schedule, blinds on a timer, ceiling fan habits, off-peak appliance timing, and a switch for the rarely used rooms.
- Small one-time buys. A box of filters, a switched power strip, a smart plug for the dehumidifier, a door sweep kit, and weatherstripping tape.
- Mid-range, high-return. Blackout curtains or cellular shades for the sunniest window, a smart thermostat once you have confirmed your system can take one, and a properly sized box fan for bedroom cooling.
- Professional work. Duct sealing, attic insulation and air sealing, and a high-efficiency system replacement when your current one is genuinely at the end of its life.
Two rules before the last tier. Get a load calculation done so the replacement is sized for the house, not for the old system, and ask your utility about rebates before you sign anything. A new unit running a 3-6 percent efficiency loss because it is oversized will not save you what the label promises.
Myths That Cost You Money
Closing the vents in unused rooms. This is the most repeated tip on summer advice pages and one of the worst. Closing supply vents raises static pressure in the duct system, reduces airflow over the evaporator coil, and can lead to a frozen coil and a failed unit. Experienced homeowners in r/homeowners threads flag it for exactly this reason. Leave the vents open unless your system has zone dampers designed to be closed.
Blast to 60°F, then coast. Debunked in r/CorpusChristi and r/Frugal discussions and easy to reason out. The compressor is a single-speed machine. A colder setpoint buys runtime, not a colder house.
A bigger air conditioner will cool the house better and cost the same. Oversized systems short-cycle, run less efficiently, and frequently freeze the coil. Size is a calculation, not a purchase decision.
Line-drying always wins. It genuinely cuts dryer use and it is free, but summer sun fades and damages fabric, and Edmonton summers give you plenty of hot dry days. A mix suits most families better than an all-or-nothing approach.
Fan cooling is a substitute for air conditioning. Fans move air; they do not remove heat and humidity. They make a higher thermostat setting feel tolerable, which is a genuinely valuable saving, but they are not cooling.
Turn Your Bill Into a Month-Over-Month Scorecard
Two minutes a month, and it turns all of this into something you can actually track.
- Find the kWh line on your bill and write it down next to last month’s.
- Find your rate per kWh and compare that too. Rising usage and rising rate look the same from the total alone.
- Note whether the month had an unusual number of hot days, because weather makes year-over-year comparisons unfair.
- Watch for step changes. A jump that appears in the same month every year is usually a device, not the weather.
- If you want hour-by-hour detail, many utilities offer a free meter-reading or usage-monitoring service that makes phantom loads visible.
Frequently Asked Questions
What runs up your electric bill the most?
In most homes, residential cooling and the equipment that supports it: the air conditioner compressor, the dehumidifier, fans, and the refrigerator and freezer working harder against a warm kitchen. Next on the list are the water heater at about 18 percent of home energy use, electronics and standby loads running 24 hours a day, pool pumps, and EV charging. Your bill is usage multiplied by rate, so check the kWh line before blaming the total.
What is the simple trick to cut your electric bill?
Set your thermostat to 78u0026deg;F (26u0026deg;C) and add a setback of 7 to 10u0026deg;F for eight hours when the house is empty or you are asleep. Every degree you raise the setpoint cuts roughly 3 to 6 percent of cooling energy, and the U.S. Department of Energy puts the annual saving from a proper setback at up to 10 percent. It costs nothing and takes ten minutes to set up.
Is it cheaper to run AC all day or just at night?
Neither, if you are lowering the setpoint to compensate. Most central systems have a single-speed compressor, so a colder setting means longer runtime at the same cost per hour. What saves is a moderate setpoint held steady, with a setback applied for the eight hours the house is empty. Repeatedly turning the system off and letting the house reheat makes it work harder every time it restarts, so steady moderate beats cycling cold.
Why is my electric bill so high during summer?
Four things stack up. Cooling becomes the largest controllable share of the bill, often 40 to 50 percent once the dehumidifier and fans are counted. Hot weather also makes the refrigerator and freezer run longer. Your utility’s price per kWh may have changed at the same time, which is invisible unless you read the rate column. And on a time-of-use plan, anything running during the evening peak costs multiples of what the same energy costs overnight.
How do I keep my electric bill low with electric heat?
Schedule around the peak window rather than trying to use less. Run the water heater in off-peak hours or turn it to 120u0026deg;F (49u0026deg;C), charge an EV overnight, and pre-heat with a heat pump rather than electric baseboard heat, which converts one unit of electricity into roughly half a unit of heat. If your equipment is a heat pump, its efficiency depends on the thermostat setpoint, so avoid large swings.
Is 72 a good temperature for AC in the summer?
It is fine, and many households prefer it, but it is not the most efficient setting. The efficiency number to aim at is 78u0026deg;F (26u0026deg;C), with ceiling fans on high making a slightly higher setpoint feel several degrees cooler. A good compromise is 74 to 76u0026deg;F in the daytime with fans running, and a setback to 76 or above overnight. If the house holds babies, older adults or someone medically vulnerable, comfort and safety outrank the number.
How do I save on AC bills during summer?
Rank the moves by return on effort. Start with the thermostat setpoint and schedule, then a clean air filter, then blinds closed on sun-facing windows, then ceiling fans so you can run a higher setpoint. After that come off-peak appliance timing, the water heater at 120u0026deg;F, and switched power strips. Professional work, duct sealing and insulation, comes last because you will not get full benefit from a new system if the free habits are not in place.
Should I close the vents in rooms I am not using?
Usually not, and it can cause real damage. Closing supply vents raises static pressure in the duct system, cuts airflow across the evaporator coil, and can freeze the coil and shut the whole system down. Experienced homeowners flag this one repeatedly in forums. Leave the vents open, or close them only if your system has zone dampers that were designed for it. Closing doors to unused rooms is a better way to direct the cool air you already have.
What can I do in a rental apartment to cut cooling costs?
Work the levers you control. Keep the window unit filter clean, shade its outdoor side, and close a blackout curtain on the window it sits under. Close doors to unused rooms and use a box fan to move air so the unit’s cool output reaches further. Replace light bulbs with LEDs, kill phantom loads with a switched power strip, and set the thermostat to 78u0026deg;F (26u0026deg;C). Ask your landlord in writing about shared-meter allocation and the building’s rooftop or chiller equipment.
Is duct sealing worth the cost?
Usually yes, and ENERGY STAR reports that roughly 20 to 30 percent of the air moving through a typical duct system never reaches the rooms it is meant to serve. Sealing those leaks can improve system efficiency by up to 20 percent. Seal accessible sections yourself with mastic and foil tape, then have a professional do the hard-to-reach runs. A blower door test tells you how much air is leaving the house at all, which also tells you where the biggest remaining gains are.
Your 30-Day Plan to a Lower Summer Electric Bill
Learning how to lower your electric bill in summer does not require a renovation, a new system, or a painful week of discomfort. It requires about six habits and one monthly check-in.
Week one: set the thermostat to 78°F (26°C), program a setback for the hours the house is empty, and clean or replace the air filter. Week two: close blinds on sun-facing windows each morning and run ceiling fans counter-clockwise whenever you raise the setpoint.
Week three: move laundry, the dishwasher and any EV charging off-peak, turn the water heater to 120°F (49°C), and hunt for the space heater and the always-on electronics. Week four: call your utility about your rate plan, rebates and any energy audit offer, then write your kWh number down to compare next month.
Do those four weeks in order and the expensive upgrades become optional rather than urgent. And if the people in your home are babies, older adults or medically vulnerable, treat the cooling budget as a fixed cost and find the savings on everything else on this page instead.