How to Lower Your Electricity Bill This Summer

Electricity costs have risen significantly over the past few years, and summer is when the bill usually peaks. Air conditioning accounts for roughly 12% of average US home energy use annually — but in hot climates during summer months, that share can jump to 40–50%.

The good news is that a handful of changes, most of them free, can cut your bill by 15–30% without meaningfully affecting comfort.

The Biggest Lever: Your Thermostat

The Department of Energy estimates that every degree you raise your thermostat saves about 3% on cooling costs. Setting your thermostat to 78°F when you're home and 85°F (or off) when you're away can save $30–$80 per month depending on your climate and home size.

A programmable or smart thermostat automates this without requiring daily attention. If you don't have one, a basic programmable model costs $25–$40 and pays for itself within the first month of summer use. A smart thermostat (Nest, Ecobee) costs more but learns your patterns and can be controlled remotely — useful if your schedule varies.

One counterintuitive finding: don't turn the AC completely off when you leave for work if you live in an extremely humid climate. Allowing the home to get very hot and very humid increases the time — and energy — required to bring it back to a comfortable temperature when you return. A setback of 7–10 degrees is the sweet spot in most climates.

Ceiling Fans: Run Them Right

Ceiling fans don't cool the air — they cool you by creating a wind-chill effect. This means:

They only help when someone is in the room. Turn them off when you leave.
In summer, blades should spin counterclockwise (when viewed from below) to push air down and create airflow you can feel.
Running a ceiling fan alongside AC allows you to raise the thermostat by 4°F with no perceived comfort difference, saving roughly 12% on cooling costs.

Many people run fans in empty rooms all day. This wastes energy without benefit.

Seal Air Leaks

Air conditioning is expensive. Paying to cool the outdoors is more expensive. Gaps around doors, windows, electrical outlets, and pipe penetrations allow cool air to escape and hot air to enter.

The most effective no-cost fixes:

Weatherstripping on door frames (a $10 kit from any hardware store, takes 20 minutes per door)
Door sweeps on exterior doors
Foam gaskets behind outlet and switch plates on exterior walls
Caulk around window frames where you can feel airflow

A home energy audit — often available free from utility companies — will identify where your biggest losses are. Some utilities offer rebates on air sealing materials and installation.

Change Your AC Filter

A dirty filter forces your AC unit to work harder to pull air through, increasing energy use by 5–15%. Filters should be changed every 30–90 days depending on type, household size, and whether you have pets.

This takes two minutes and costs $5–$20 depending on filter quality. It's one of the highest-return maintenance tasks for any home with central air conditioning.

Time Your Energy Use

Most utilities use time-of-use pricing, where electricity costs more during peak demand hours (typically 4–9 p.m. on weekdays in summer). Running appliances outside those hours — especially dishwashers, washing machines, and dryers — can reduce your bill meaningfully.

Pre-cool your home before 4 p.m. and let the thermostat drift up slightly during peak hours. Many smart thermostats can be programmed to do this automatically.

Windows and Shading

Direct sunlight through windows significantly increases cooling load. Closing blinds and curtains on south and west-facing windows during the hottest part of the day (10 a.m.–4 p.m.) can reduce solar heat gain by 40–50%.

Exterior shading is even more effective — awnings, trees, and exterior shutters block heat before it enters the glass. If you're choosing window treatments, cellular shades (honeycomb blinds) provide better insulation than standard blinds.

Appliances That Generate Heat

Ovens, dryers, dishwashers, and even dishwashers generate heat that your AC has to counteract. During summer:

Use your oven less; shift toward stovetop cooking, microwave, or outdoor grilling
Run the dryer in the evening when outdoor temperatures are lower
Use the dishwasher's air-dry setting instead of heated dry

These changes don't require sacrifice — just timing adjustment.

Check Your Insulation

Attic insulation is the single biggest factor in how well your home holds conditioned air. Most older homes are under-insulated. Adding insulation to an attic that's below recommended levels can reduce cooling and heating costs by 15–25% annually. This is a one-time cost ($1,000–$3,000 depending on size) that pays back within 3–5 years in energy savings and can be partially offset by utility rebates.

You don't have to choose between comfort and a manageable bill. Most of the wins here come from changing when and how you run things, not from running them less. Start with the thermostat and fan adjustments — they cost nothing and can cut your bill by 15% before the heat even arrives.