The Honeywell YTHX9421R5051 can be used in the following applications:
The Honeywell PRESTIGE IAQ 2.0 Comfort System Thermostat Kit YTHX9421R5051 will connect up to three whole house systems including your humidifier, dehumidifier, ventilation and air conditioner system. This Honeywell comfort system thermostat can adjust the temperature with the Portable Comfort Control from anywhere in your home.
The Prestige IAQ 2.0 features a high definition, full color display that is easy to see and use. When you first install the Honeywell comfort system thermostat, it will program itself based on a series of questions it asks you. Also known as part number YTHX9421R5051, this genuine Honeywell thermostat also has convenient 7 day programming, which allows you to have different settings for each day of the week.
Honeywell PRESTIGE IAQ HD Thermostat Kit specifications:
The Prestige IAQ 2.0 Comfort System will also save you up to 33% on your annual energy costs when used correctly. The YTHX9421R5051 comes with two Prestige duct sensors for easy installation.