Honeywell YTH9421C1010 Visionpro IAQ Programmable Universal Thermostat

Advanced dual-fuel control Three wires to the 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 a single point in the home Automatically raises humidity levels throughout all rooms in the home, moisturizing air to prevent symptoms of dryness and to protect hardwood flooring and woodwork