Honeywell YTH9421C1010 Automatic or Manual Changeover, 4H/2C. This VisionPRO IAQ touch screen universal programmable thermostat offers electronic control of 24 Vac heating and cooling systems. in addition to humidification, dehumidification and ventilation all with just 3 wires to the thermostat. VisionPRO IAQ Total Home Comfort System.
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