Free changes
- Set the thermostat to 78°F when home, and higher when away.
- Use ceiling fans (counterclockwise in summer). They let you feel 3–4°F cooler.
- Close blinds on sun-facing windows during the day.
- Run the dryer, dishwasher and oven in the evening.
- Keep vents and returns unblocked.
Low-cost fixes
- Replace the air filter regularly.
- Rinse the condenser coil each spring.
- Weatherstrip doors and caulk window gaps.
- Install a programmable or smart thermostat.
- Shade the outdoor unit, but keep airflow clear.
- Switch to LED lighting, which gives off less heat.
Bigger investments
- Seal and insulate ducts in the attic.
- Add attic insulation and air sealing.
- Install solar screens or low-e window film.
- When replacing, choose a right-sized, higher-SEER2 system.
Get a professional tune-up before summer. A dirty coil or low charge can quietly add 10% or more to your cooling costs.
