BEST THERMOSTAT SETTINGS IN SUMMER CALIFORNIA
The Short Answer
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For Savings: Set it to 78°F while home, 85°F while away, and 75°F for sleep.
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For Comfort: Set it to 72°F while home, 78°F while away, and 69°F for sleep.
The Expert Guide: Efficiency vs. Maximum Comfort
Option 1: The “Energy Saver” Strategy
This is the standard recommendation for California residents to avoid “bill shock” and help the power grid during Flex Alerts.
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At Home (78°F): This is the “magic number.” It keeps the house from becoming an oven without forcing the compressor to run 24/7. Use ceiling fans to make this feel closer to 74°F.
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Away (85°F): Don’t turn the AC off! Setting it to 85°F keeps the humidity down and ensures your electronics and pets stay safe while you’re at work.
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The “Peak” Pivot: Between 4 p.m. and 9 p.m., electricity rates in California skyrocket. If you can tolerate 78°F or 80°F during these hours, you will save significantly on your monthly bill.
Option 2: The “Maximum Comfort” Strategy
If you prefer a crisp, cool environment and don’t mind a higher utility bill, this strategy focuses on maintaining a steady “thermal envelope.”
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At Home (72°F – 74°F): At this temperature, the AC runs long enough to properly dehumidify the air. This creates that “sharp” cold feeling that makes a home feel like a true escape from the California sun.
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Away (77°F – 78°F): By keeping the house at 78°F while you are out, you prevent “Heat Soak.” This is when your walls and furniture absorb heat. If the house stays relatively cool all day, the system can reach your 72°F comfort goal much faster when you get home.
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Sleeping (68°F – 70°F): Sleep experts and HVAC pros agree that a cooler room leads to deeper REM cycles. Dropping the temp at night is also easier on your system because the outdoor air is cooler, allowing the unit to shed heat more efficiently.
Comparison at a Glance
Situation |
The Saver (Efficiency) |
The Sanctuary (Comfort) |
| Home & Active | 78°C | 72°F |
| Away at Work | 85°F | 77°F |
| Sleeping | 75°F | 69°F |
| Peak Hours (4-9 PM) | Aim for 78°F+ | Keep it at 74°F |
Pro-Tip for Both Options:
Regardless of the temperature you choose, maintenance is key. A dusty air filter or a dirty outdoor condenser coil will make a 72°F goal impossible to reach and a 78°F goal more expensive than it needs to be. Swap your filters every 30 to 90 days to keep the airflow moving freely!