How to Lower Your Electric Bill This Summer in Illinois (HVAC Tips)

The average Illinois household spends $400–$700 on air conditioning from June through August. In Will County, where summer temperatures regularly hit 90°F+ and humidity makes it feel even hotter, cooling costs can dominate your electric bill. The good news: most of the biggest savings come from simple, low-cost steps — not expensive equipment upgrades.

1. Schedule an AC Tune-Up Before the Heat Hits

A dirty or poorly maintained AC system can use 10–25% more energy than a clean, well-tuned system. An annual tune-up — which includes cleaning the coils, checking refrigerant levels, and testing electrical components — restores peak efficiency. Lockport Heating's AC tune-up is $79 this summer (regularly $129). Most customers recover the cost in energy savings within one or two months.

2. Set Your Thermostat Strategically

The U.S. Department of Energy recommends 78°F when you're home and 85°F when you're away. Every degree you raise the thermostat saves approximately 3% on cooling costs. A programmable or smart thermostat (Ecobee, Nest, or Honeywell Home) automates this schedule so you never have to think about it. Smart thermostats typically save $100–$200 per year.

3. Replace Your Air Filter Monthly

During peak cooling season, replace your air filter every month — not every three months. A clogged filter forces your AC to work harder, consuming more energy and stressing the equipment. Standard 1-inch filters cost $5–10 each. This is the lowest-cost, highest-impact maintenance step you can take.

4. Use Ceiling Fans Correctly

Ceiling fans don't cool the air — they create a wind-chill effect that makes you feel cooler. This allows you to raise the thermostat 4°F without noticing a difference in comfort, saving about 12% on cooling costs. Make sure your fans run counterclockwise in summer (the standard direction when viewed from below). Turn fans off when you leave the room — they cool people, not spaces.

5. Block Heat Gain Through Windows

Up to 30% of unwanted heat enters your home through windows. Closing blinds and curtains on south- and west-facing windows during the hottest part of the day (noon to 6 PM) can reduce cooling loads significantly. Blackout curtains or cellular shades provide the best insulation. Exterior shading — awnings, trees, or solar screens — is even more effective.

6. Seal Air Leaks Around Doors and Windows

Air leaks around doors, windows, and electrical outlets allow hot outdoor air to infiltrate your home, forcing your AC to work harder. Weatherstripping and caulk are inexpensive fixes that can reduce cooling costs by 10–20%. Check for drafts by holding a lit incense stick near door and window frames on a windy day.

7. Avoid Heat-Generating Appliances During Peak Hours

Ovens, dishwashers, and dryers generate significant heat. Running them after 8 PM — when outdoor temperatures drop and electricity rates are lower on time-of-use plans — reduces both your cooling load and your electricity cost. Grilling outside instead of using the oven on hot days is a practical summer habit that saves real money.

8. Have Your Ductwork Inspected for Leaks

The EPA estimates that 20–30% of conditioned air is lost through leaky ducts in a typical home. If your ductwork hasn't been inspected in years, a professional duct inspection can identify leaks that are silently wasting energy. Sealing duct leaks is one of the most cost-effective energy improvements available to Will County homeowners.