Honeywell Programmable 4H/2C Touchscreen Thermostat Kit (White/White)
Honeywell Programmable 4H/2C Touchscreen Thermostat Kit (White/White)
Item # YTHX9421R5085WW

The completely redesigned Prestige IAQ from Honeywell still offers the robust RedLINK™ wireless capabilities you trust to deliver a total solution – now in a smaller, sleeker profile for design-conscious residential and light commercial end users. The Prestige features an effortless, 7-day programmable color touchscreen thermostat that provides control of temperature, humidification, dehumidification and ventilation for up to 4H/2C heat pump systems.

This kit includes the Prestige THX9421, Equipment Interface Module (EIM) and 2 duct sensors.

Requires RedLINK Internet Gateway for Internet connectivity.

Features and Benefits

This kit includes an Equipment Interface Module (THM5421R1021) and 2 duct sensors (C7735A1000). 

  • Up to 4H/2C conventional and heat pump systems
  • 7 day programmable
  • 60% smaller footprint
  • Full-color, customizable, high-definition screen
  • Choice of 4 high-gloss acrylic frames (BB, SG, WG, WW)
  • Monitor and control multiple buildings from a computer, tablet or smartphone
  • Self-monitoring diagnostics send alerts for maintenance or service issues
  • Question-based setup eliminates the need for a manual
  • Stores 25 alerts to help technicians easily determine that part of the system needs attention
  • Minimum/maximum indoor/outdoor temperatures, humidity, run time, Delta T and more organized by hour, day, week or month
  • Four assignable inputs for wired sensors, remote setback or dry contacts
  • Pre-populated contractor contact information available at the touch of a button
  • Available with Portable Comfort Control
  • Hardwired 
  • 5-year warranty
Product Specifications
 Up to 4H/2C conventional and heat pump systems
6.00” x 4.56” x 1.25” (WHD)
Display Size
10 in2
Input Voltage
Operating Temperature
0° to 120° F
Operating Humidity
5% to 95%, non-condensing
Storage Temperature
-30° to 150° F
Temperature Sensors
Up to 4 indoor (C7189U1005) or outdoor (C7089U1006) with equipment interface module (THM5320R1000)
Short Cycle Protection
5 minutes, adjustable in 1 minute increments
Communications Protocol
RedLINK capable
Control Range
40° to 99° F


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Honeywell RedLINK & Wi-Fi Training

Honeywell RedLINK & Wi-Fi Training

Training session on Honeywell RedLINK and Wi-Fi products.


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