The C.A.P. AIR-3DN separately controls the day temperature, night temperature and CO2 production within the growing area. External temperature probes have proven to be highly accurate and reliable. 

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.

Specifications:

Main power voltage: 120 volts
Maximum amperage: 15 amps
Temperature control range: 50-115° F
Temperature operating range: 32-120° F
Relay operating life: 100,000 electrical
Photocell operation: Activate CO2 during day

More info (PDF format)