Indicator lights verify day or night settings, plus show exhaust and/or CO2 activation. The AIR-3DN has BOTH night heat and night cooling outlets to allow for flexibility in environmental control!
Utliziing a photo cell, the AIR-3DN controls your CO2 device so it only activates when your lights are on. It further reduces CO2 usage by automatically disabling the CO2 outlet when your exhaust fan turns on due to high temperatures. CO2 generators or valves operating on 120 volt plug into standard receptacles.