Tip
Beat heat without driving up the AC bill
Block solar gain
- Close blinds/curtains on south and west exposure during peak sun (12-6 PM)
- Use thermal-backed curtains in bedrooms (cuts solar heat gain by 25-40%)
- Plant deciduous trees on south/west sides (long-term — but transformative)
- Cool roofing or radiant attic barrier (longer-term capital project)
Manage internal heat
- Run dishwasher and laundry after 8 PM (off-peak in time-of-use plans + avoids midday heat)
- Cook outdoors when possible (grill, smoker, induction cooktop on patio)
- Switch to LEDs everywhere (5-10x less heat output than incandescents)
- Unplug rarely-used electronics (every appliance produces some heat)
Optimize AC
- Set thermostat 78°F daytime, 76°F sleeping
- Allow 4-7°F setup during away periods
- Keep doors and windows closed during AC operation
- Run ceiling fans counter-clockwise (cooling breeze, not actual cooling)
- Replace AC filter monthly during heaviest use
Whole-house and attic fans
If overnight low temps drop below 70°F, a whole-house fan moves cool night air through the home and exhausts hot daytime air through attic vents. Operating cost is 1/10 of AC. Install with a tight-fitting damper (otherwise winter heat losses negate savings).