Yes, it is generally okay to leave your air conditioner on 24/7 during hot weather, and in fact, that is how central air conditioning systems are designed to operate, by cycling on and off automatically to maintain a set temperature. Modern air conditioners, especially inverter and variable-speed models from brands like Daikin, Carrier, Tempstar, and York, are engineered for continuous operation and are more efficient when left at a consistent setpoint rather than being turned completely off and on. Leaving it on 24/7 helps control humidity, prevents mold growth, protects wood furniture and electronics from heat, and keeps indoor air filtered. However, there are best practices to follow to avoid high energy bills and premature wear. Set the thermostat to a reasonable temperature like 74 to 78 Fahrenheit when home and 80 to 82 when away rather than turning it off completely, use a programmable or smart thermostat to raise the temperature slightly when away, keep filters clean every 30 to 60 days, ensure the outdoor unit has clear airflow, and have annual maintenance. Running the AC non-stop without any break in extreme heat is normal, but if you leave for more than a day, raising the setpoint 7 to 10 degrees saves energy without risking humidity damage. Continuous operation does not damage the compressor because it cycles internally via thermostat control.
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