For most modern homes equipped with central air conditioning and programmable or smart thermostats, it is generally much more energy-efficient and better for the system to leave the air conditioner running on an automated schedule rather than constantly turning it manually on and off. Constantly shutting the AC off and turning it back on forces the system to work overtime cooling down a hot, humid house from scratch, which consumes a massive amount of electrical energy and places severe mechanical stress on the compressor motor and electrical contactor during startup surges. However, if you are going to be away from home for an extended period, such as for a full workday or a multi-day vacation, raising the thermostat setting by seven to ten degrees or using an eco-mode schedule is highly recommended to save on electricity costs without letting the indoor climate become excessively hot and humid.
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