VisionPRO Indoor Air Quality (IAQ) touchscreen universal programmable thermostat provides electronic control of 24-volt (AC) heating and cooling systems in addition to humidification, dehumidification and ventilation with just three wires to thermostat. Automatic or manual changeover, 4 heat/2 cool stages. Advanced dual-fuel control. Three wires to living space allows for easy equipment upgrade without having to run additional thermostat wire. Thermostat connects with equipment interface module or EnviraZONE panel to control temperature, humidification, dehumidification and ventilation from single point. Automatically raises humidity levels throughout home, preventing dryness and protecting hardwood flooring and woodwork. Removes air pollutants by exchanging stale air with fresh, filtered air.