Auto vs On: How Your Thermostat Fan Setting Affects Comfort and Energy Bills

The fan setting on a home thermostat plays a significant but often overlooked role in indoor comfort and energy consumption. The 'Auto' mode runs the fan only during active heating or cooling cycles, making it more energy-efficient and better at controlling indoor humidity during summer. The 'On' setting keeps the fan running continuously, resulting in more consistent temperatures and improved air filtration throughout the home. However, this constant operation comes at a higher electricity cost. Households with allergy sufferers or pets may benefit from the 'On' setting, while others should weigh their priorities before choosing.