Running the home thermostat's fan continuously, even when no one is home or during the night, is known as "circulating" or "on" mode. This means the fan runs continuously, even when the cooling (or heating) system is not actively conditioning the air. There are both benefits and drawbacks to using this mode, and they should be considered based on your specific needs and preferences.
Benefits of Running the Fan Continuously:
Improved Air Circulation: Keeping the fan on helps circulate the air throughout your home consistently. This can lead to more even temperatures in different rooms and reduce hot or cold spots.
Better Air Filtration: Continuous fan operation allows air to pass through the HVAC's air filter more frequently, enhancing the removal of dust, allergens, and other airborne particles. This can be especially beneficial for individuals with allergies or respiratory issues.
Humidity Control: Running the fan can help control humidity levels by promoting air movement. Lower humidity levels can make your home feel more comfortable.
Reduced Noise: The constant low-level noise of the fan running can help mask other noises in the house or from outside, potentially providing a more peaceful environment for sleeping.
Drawbacks of Running the Fan Continuously:
Energy Consumption: Running the fan continuously can increase energy consumption, as the fan motor uses electricity even when the cooling (or heating) system is not actively running. This could lead to higher utility bills.
Less Energy Efficiency: When the fan runs continuously, it may reduce the system's overall efficiency. During the cooling process, the fan's continuous operation may lead to slightly warmer air being blown into the living spaces since the air passing over the cooling coils doesn't have enough time to reach its coldest temperature.
Comfort Issues: Some people might find the constant airflow uncomfortable, especially during cooler months when the constant circulation of air can create a drafty feeling.
Wear and Tear: Continuous operation can put additional strain on the fan motor and other components, potentially leading to more frequent maintenance or earlier replacement.
Conclusion:
Ultimately, the decision to run the home thermostat's fan continuously depends on personal preferences and priorities. If improved air circulation, better filtration, and humidity control are essential to you, running the fan continuously might be worth considering. However, keep in mind the potential drawbacks, especially the increase in energy consumption and potential comfort issues.
If you're looking to balance comfort and energy efficiency, you might want to consider using the fan's "auto" mode instead. In this mode, the fan only runs when the cooling (or heating) system is actively conditioning the air. This way, you can still benefit from improved air circulation during cooling or heating cycles without the constant operation when it's not needed.