I use the Greenhouse Master, w Co2, sealed room.
Works well. Cost, 3yr warranty, day/night settings, and ability to computer connect are reasons I went with this model. Usb Computer connect kit is extra.
Not for Air Conditioner control......ACs are not designed to have their incoming power flipped on/off. I use it for humidifier, heater, Co2. Sealed room, so I don't use the "cool" output. Fuzzy logic keeps Co2 ppm much more consistent when enable, Vs disabled. Tested it.