"CIRC" on a thermostat typically stands for "Circulate" or "Circulation" mode. When you set your thermostat to "CIRC," it activates the circulation fan in your HVAC (Heating, Ventilation, and Air Conditioning) system. This mode is different from the regular cooling or heating modes.
In Circulate mode:
Fan running continuously: The circulation fan runs continuously, even when the heating or cooling system is not actively heating or cooling the air. It helps in maintaining consistent airflow throughout the home.
Improved air distribution: By keeping the fan running, the thermostat helps distribute air more evenly, which can lead to better temperature regulation and air quality throughout the house.
Air filtration: The continuous operation of the fan also helps in filtering and cleaning the air, as it passes through the HVAC's air filter. This can improve indoor air quality by removing dust, allergens, and other particles from the air.
Reduced hot or cold spots: Circulate mode can help eliminate hot or cold spots within the house by moving air to areas that might not receive sufficient airflow during regular heating or cooling cycles.
Energy consumption: While Circulate mode can enhance comfort and air quality, it may lead to slightly higher energy consumption compared to running the fan only during heating or cooling cycles.
Different thermostats might have variations of this mode or use different terminology, such as "Fan" mode, "Fan On," or "Continuous Fan." It's essential to consult your thermostat's manual to understand the specific functionality and options available for the CIRC or Circulate mode on your particular thermostat model.