Summer electricity bills are among the highest of the year. Instead of suffering through the heat, use these seven techniques to stay cool while keeping costs down.

1. Set AC to 28 Degrees

Japan’s Ministry of the Environment recommends 28 degrees for cooling. Each degree higher reduces power consumption by about 10%. Combine with a fan for the same comfort at a lower setting.

2. Clean AC Filters Every Two Weeks

Dirty filters reduce cooling efficiency by up to 20%. A quick vacuum every two weeks maintains peak performance and lowers electricity usage.

3. Set Refrigerator to Medium

Switching from “strong” to “medium” saves about 20% power. Your fridge will still keep food cold enough in summer at the medium setting.

4. Unplug Standby Electronics

Standby power from unused appliances can cost thousands of yen per year. Use power strips with switches to cut all standby power at once.

5. Use Heat-Blocking Curtains and Window Film

About 70% of indoor heat comes through windows. Heat-blocking curtains or window insulation film can let you raise your AC setting by 1-2 degrees while maintaining comfort. Available at home centers from 2,000 yen.

6. Combine Fan with AC

Cold air sinks to the floor. Point a fan toward the AC to circulate cool air throughout the room. This allows you to raise the set temperature by one degree.

7. Review Your Electricity Rate Plan

Time-based rate plans like TEPCO’s Yoru-Toku offer cheaper nighttime electricity. Consider switching to a new power retailer for better summer rates.

Combine several of these tips to reduce your summer electricity bill by 20-30%. Start with the easiest ones today.