Optimal Air Conditioner Modes in Summer and Winter for Maximum Savings (Los Angeles Guide)

Running your air conditioner efficiently is one of the fastest ways to reduce energy costs in Los Angeles, where hot summers and mild winters still create year-round HVAC demand. The key is choosing the right operating mode, temperature, and schedule—then supporting it with simple habits that prevent wasted power. Summer (cooling season): Use COOL mode for true temperature control, and aim for 76–78°F when you’re home. If you’re away for several hours, raise the setpoint to 82–85°F instead of turning the unit fully off—your system won’t need a long, high-power “catch-up” cycle. ECO mode can help by reducing compressor runtime, while FAN mode is best used only when you want air circulation (it won’t remove heat like COOL). In humid periods, DRY mode may feel comfortable at a slightly higher temperature because it prioritizes moisture removal. Keep doors and windows closed, use blinds during peak sun, and run ceiling fans to feel 2–4°F cooler without lowering the thermostat. Winter (heating season): If your system includes a heat pump, use HEAT mode and set 68–70°F for comfort and savings. Avoid frequent manual changes—steady settings reduce short cycling. AUTO can work if it doesn’t switch modes too often; if it does, lock the system into HEAT. At night, lower the setpoint a few degrees and use bedding or zoned heating if available. Year-round savings: Replace or clean filters every 1–3 months, keep outdoor units clear, seal air leaks, and schedule seasonal maintenance. Smart thermostats and timers are especially effective in Los Angeles, where daily temperature swings make “set and schedule” strategies pay off quickly.