Grozone Controls SCC1 Temperature, Humidity, CO2 Controller - Simple One Series An easy-to-use alternate solution to HTC Climate Controller: just connect your fan, your dehumidifier or humidifier, your CO2 generator, set the knobs and you're ready! Two built-in LVC1 (Low Voltage Relays) to control high power HVAC Systems (A/C, Dehumidifier