The Day/Night Temp & CO2 Control provides the ability to coordinate supplemental CO2 with your ventilation equipment. It features separated day and night temperature settings. The Day/Night Temp & CO2 Control has a photo cell and CO2 outlet. The photo cell ensures that your CO2 device (CO2 valve or generator) only activates when your lights are on. It also has a night heat outlet to allow you to heat the area at night if necessary to maintain the proper temperature. To conserve CO2, the CO2 outlets are automatically disabled while your ventilation equipment is running. The Day/Night Temp & CO2 Control is rated for 15 amps @ 120 volts.