Whether your indoor air handler should run continuously depends on your thermostat fan setting preference. If your thermostat blower fan control is switched to "On," the air handler fan will run constantly day and night, circulating indoor air through your filtration system whether or not your compressor or furnace is heating or cooling. Running the fan continuously helps eliminate hot and cold spots throughout your home and filters air more frequently, but it consumes extra electricity and can reintroduce humidity into your living space during summer. If your fan control is set to "Auto," the air handler will only run intermittently whenever your HVAC system is actively executing a heating or cooling cycle. You can verify your setup by checking your thermostat fan mode, which should be set to "Auto" for standard energy-efficient operation.
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