VisionPro Indoor Air Quality (IAQ) programmable wireless thermostat eliminates need for multiple controls, managing temperature, humidification, dehumidification and ventilation from single touch-screen control. TH9421U touch-screen universal programmable thermostat provides electronic control of 24-volt (AC) heating and cooling systems or 750-millivolt (mV) heating systems in addition to humidification, dehumidification and ventilation. RedLINK wireless enabled. Thermistor sensor element. Standard VisionPro features. Connects with equipment interface module or Envirazone panel. Automatically lowers humidity and removes pollutants, using air conditioning or whole-house dehumidifier.