10 Ways to Lower Your Electric Bill This Summer
Last July, my LG&E bill hit $287. For a three-bedroom ranch in Jeffersonville. I nearly choked on my iced tea. That number sent me on a mission to figure out exactly where every kilowatt-hour was going and what I could actually do about it without turning my house into a sauna. Twelve months later, my July bill was $174. Same house, same family, same heat index topping 95 degrees for weeks on end.
Whether you're on LG&E/KU in the Louisville metro, Indiana Michigan Power up north, or Duke Energy in southern Indiana, summer electricity rates are brutal. The average residential rate in our area runs between 11 and 14 cents per kWh, and air conditioning accounts for roughly half your total summer electric bill. That means every small change you make to how you cool your home has an outsized impact on what you pay.
Here are ten things that actually moved the needle for me and for the homeowners I talk to regularly across the Kentuckiana area.
1. Set Your Thermostat to 78 Degrees (and Actually Leave It There)
I know, I know. Seventy-eight sounds warm. But the Department of Energy estimates that every degree you lower your thermostat below 78 costs you roughly 3% more on your cooling bill. If you've been running your AC at 72, bumping it up to 78 could save you 18% or more per month.
On a $250 summer electric bill, that's $45 back in your pocket each month. Over June, July, and August, you're looking at $135 in savings just from adjusting a dial.
A programmable or smart thermostat makes this effortless. Set it to 78 when you're home, 82 to 85 when you're at work, and let it pre-cool 30 minutes before you walk in the door. The Ecobee and Nest models pay for themselves in a single summer for most households.
Estimated annual savings: $100 to $180
2. Seal Your Ductwork
This is the single most overlooked energy fix in residential homes, and it's a big one. The average home loses 20% to 30% of its conditioned air through leaky ducts, according to Energy Star. You're paying to cool air that never reaches your living space. It leaks into your crawlspace, your attic, your walls.
Walk down to your basement or crawlspace with a flashlight and look at where your ductwork connects. If you see gaps, disconnected joints, or deteriorated duct tape (ironic, since duct tape is terrible for actual ducts), you've found your problem. Mastic sealant and metal-backed foil tape are the proper fix. A roll of foil tape costs $8 at Lowe's or Home Depot.
If your ducts run through an unconditioned attic, insulating them with R-6 duct wrap is a game changer. An afternoon of work and $60 in materials can cut your cooling costs by 15% to 20%.
Estimated annual savings: $120 to $300 (DIY sealing and insulating)
3. Use Ceiling Fans Strategically
Ceiling fans don't cool rooms. They cool people. The moving air creates a wind-chill effect on your skin, making you feel about 4 degrees cooler. This matters because a ceiling fan costs roughly 1 cent per hour to operate. Your central AC costs 30 to 50 cents per hour.
The catch: fans only help when someone is in the room. Running a ceiling fan in an empty bedroom is just wasting electricity. Make a habit of turning them off when you leave. In summer, blades should spin counterclockwise (push air down). There's usually a small switch on the motor housing to change the direction.
If you pair ceiling fans with a thermostat set to 78 instead of 72, you'll feel just as comfortable while cutting your cooling energy use by a third or more.
Estimated annual savings: $50 to $100
4. Block the Sun Before It Heats Your House
Solar heat gain through windows is responsible for roughly 30% of the cooling load in a typical home. Every square foot of window that gets direct sunlight is acting like a small space heater working against your air conditioner.
Start with your south-facing and west-facing windows. Those get hammered by afternoon sun from about noon through sunset, which happens to coincide with peak electricity rates and peak outdoor temperatures. Closing blinds or curtains on those windows during the afternoon can reduce heat gain by 45% with standard blinds and up to 77% with insulated cellular shades.
Outside, a $25 shade sail or awning over a west-facing window pays for itself within the first month of summer. Planting a deciduous tree on the west side of your home is the long game, but it can eventually reduce your cooling costs by 25% on that side of the house.
Estimated annual savings: $60 to $150
5. Service Your AC Before It Costs You
A well-maintained central air conditioner uses 15% to 20% less energy than one that hasn't been serviced. That's not marketing from HVAC companies. That's measured data from the DOE.
At minimum, change your air filter every 30 to 60 days during heavy cooling season. A clogged filter restricts airflow, forces your system to run longer, and can eventually freeze your evaporator coil. A pack of filters costs $15 to $30 depending on size and quality. There's no excuse for a dirty filter.
Beyond the filter, clean your outdoor condenser unit once a year. Shut off the power, hose down the fins gently (never pressure wash), and clear any vegetation within two feet of the unit. Bent fins restrict airflow. A $10 fin comb straightens them out in minutes.
For the full annual tune-up, a professional HVAC tech will check refrigerant levels, inspect electrical connections, clean the evaporator coil, and test system performance. In the Louisville and southern Indiana area, expect to pay $80 to $150 for a standard tune-up. If your system is low on refrigerant, that's a leak that needs fixing. Running low on charge makes your compressor work harder and die sooner.
Estimated annual savings: $80 to $200
6. Upgrade to LED Bulbs Everywhere
If you still have incandescent bulbs anywhere in your house, those bulbs are converting 90% of their energy into heat. Not light. Heat. You're paying to generate heat and then paying again to cool that heat back down with your AC.
LED bulbs use 75% less electricity and produce almost no heat. A 60-watt equivalent LED uses just 8 to 10 watts. At LG&E's residential rate, switching 20 incandescent bulbs to LEDs saves roughly $150 per year in electricity alone. Factor in the reduced cooling load from less waste heat, and the savings climb higher.
LED bulbs last 15,000 to 25,000 hours compared to 1,000 hours for incandescents. You'll buy fewer bulbs, use less electricity, and put less strain on your cooling system. A 4-pack of good LEDs costs about $8 now. There's no reason to wait on this one.
While LED upgrades are straightforward, some homes benefit from more comprehensive electrical efficiency upgrades like installing dimmer switches, smart lighting controls, or whole-home surge protection. A qualified electrician can assess your home's electrical system and recommend upgrades that maximize energy savings while improving safety and convenience. Find an electrician near you to discuss energy-efficient electrical improvements for your home.
Estimated annual savings: $100 to $200 (lighting + reduced cooling load)
7. Run Appliances After 9 PM
LG&E and KU offer time-of-use rate plans where electricity costs significantly more during peak hours (roughly 1 PM to 7 PM on weekdays in summer) than during off-peak hours. Even if you're on a standard flat-rate plan, running heat-generating appliances during the hottest part of the day forces your AC to work harder.
Your dishwasher, clothes dryer, and oven are the three biggest offenders. A single dryer cycle generates about 5,000 BTUs of heat inside your home. Run that at 3 PM in July and your AC has to remove all that heat on top of everything else.
Shift your laundry to evenings or early mornings. Run the dishwasher after dinner and let it air dry instead of using the heated dry cycle. Cook on the grill instead of using the oven. On the hottest days, a slow cooker or Instant Pot generates a fraction of the heat that a conventional oven does.
Estimated annual savings: $40 to $120
8. Insulate and Air-Seal Your Attic
Your attic is the biggest single source of heat gain in your home during summer. In the Louisville area, an unshaded attic can hit 140 to 160 degrees on a July afternoon. If your attic insulation is thin, compressed, or missing in spots, that heat is radiating straight down into your living space.
The Department of Energy recommends R-38 to R-60 attic insulation for our climate zone (Zone 4). Most older homes in Clark, Floyd, and Jefferson counties have R-19 or less up there. Adding blown-in insulation to bring your attic up to R-38 typically costs $1,200 to $2,000 for a professional install, or $400 to $700 if you rent the blower from Home Depot and do it yourself. That investment pays back in 2 to 4 years through lower heating and cooling bills.
Before you add insulation, air-seal the attic floor. Every gap around wiring, plumbing penetrations, recessed lights, and the attic hatch lets conditioned air escape. A couple cans of expanding foam and a caulk gun can seal most of these for under $30. For comprehensive air sealing around windows, doors, and other penetrations throughout your home, consider hiring professional window and door specialists who can identify and seal air leaks that drive up your energy costs year-round.
Estimated annual savings: $150 to $350 (combined heating and cooling)
9. Use a Dehumidifier Instead of Overcooling
Here in the Ohio Valley, humidity is half the battle. A day that's 85 degrees with 70% humidity feels far worse than 90 degrees with 30% humidity. Most people crank the AC down to compensate for muggy air, but that's an expensive way to solve a humidity problem.
Your AC does dehumidify as it cools, but it's not optimized for it. A standalone dehumidifier in your basement or main living area keeps indoor humidity between 40% and 50%, which is the sweet spot for comfort. At that humidity level, 78 degrees on the thermostat feels genuinely comfortable.
A good dehumidifier uses about 300 to 700 watts depending on capacity. Running it costs roughly $15 to $30 per month. But if it lets you keep the thermostat at 78 instead of 73, you'll save far more than that on cooling. The net savings typically run $20 to $50 per month during peak summer.
Look for an Energy Star-rated unit sized for your space. For a 1,500-square-foot home, a 50-pint model is usually right. Expect to pay $200 to $300 for a quality unit that will last 5 to 8 years.
Estimated annual savings: $60 to $150 (net, after dehumidifier operating cost)
10. Get a Home Energy Audit
If you've done the obvious stuff and your bills are still high, a professional energy audit tells you exactly where the money is going. An auditor uses a blower door test to measure air leakage, an infrared camera to find insulation gaps, and duct testing to quantify duct losses. You get a prioritized list of fixes ranked by cost-effectiveness.
LG&E/KU customers can get a WeCare Home Energy Assessment for free or at reduced cost through their energy efficiency programs. Duke Energy Indiana offers similar programs. Indiana Michigan Power has rebates for efficiency upgrades identified through qualified audits. Check your utility's website or call customer service to ask what's available.
A private energy audit typically costs $200 to $400 in the Louisville metro area. Most auditors will credit that cost toward any work they perform. The fixes identified usually save $200 to $600 per year, so the audit pays for itself within the first year.
Estimated annual savings: $200 to $600 (from implementing audit recommendations)
Adding It All Up
You don't have to do all ten of these at once. Start with the free and cheap ones: adjust the thermostat, close the blinds, change your filter, switch off fans in empty rooms, and shift heavy appliance use to evenings. Those five changes alone can save $150 to $400 over a single summer without spending a dime.
Then tackle the moderate investments: LED bulbs, duct sealing, and a dehumidifier. These cost $50 to $300 upfront but pay for themselves within the first cooling season.
The bigger projects, attic insulation and a professional energy audit, are fall and winter projects that set you up for savings before the next summer hits. Plan ahead and you'll be the one sipping iced tea instead of sweating over your electric bill.
Every home is different. A 1960s brick ranch in New Albany has different energy problems than a 2005 subdivision home in Sellersburg. But the physics are the same: keep the heat out, keep the cool in, and don't pay for energy you're wasting. Start with one tip this week and build from there.
Dana Hargrove is a home and garden writer covering the Kentuckiana region. She has spent 12 years writing about residential energy efficiency, home maintenance, and practical upgrades for real homeowners. Her work focuses on cost-effective solutions that make sense for Southern Indiana and Louisville area homes.
