 HONEYWELL YTH9421C1002 Automatic or Manual changeover and up to 4 heat/2 cool stages for heating and cooling systems. The TH9421U touch screen universal programmable thermostat provides electronic control of 24 Vac heating and cooling systems of 750 mV heating systems in addition to humidification dehumidification and ventilation. Features Contains all features of standard VisionPRO, except arm chair programming. 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. Automatically lowers humidity levels through al rooms in the home, utilizing air conditioning or a whole house dehumidifier to prevent dampness, stickiness or odors; symptoms often associated with air that is too moist. Removes air pollutants by exchanging the stale air in a house with fresh, filtered air better than having an open window.
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