Honeywell Home YTHX9421R5085WW/U Prestige 2-Wire IAQ Kit with RedLINK, White

Item #: HONE-YTHX9421R5085WW/U
Mfr. part #: YTHX9421R5085WW/U
UPC: 085267336451

Key specifications

Display TypeTouch Screen
Display Size8.06 sq in
Modes of OperationHeating, Cooling
Energy Star CertifYes
Power SupplyThermostat--Battery Powered

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$505.74

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Brand	Honeywell Home
Manufacturer part #	YTHX9421R5085WW/U
Application	Conventional Systems, Heat Pumps with Auxiliary Heat
Thermostat Type	Programmable, Digital, Low Voltage, RedLINK
Stages	Up to 4 Heat/2 Cool Heat Pump Systems, Up to 3 Heat/2 Cool Conventional Systems
Display Type	Touch Screen
Display Size	8.06 sq in
Modes of Operation	Heating, Cooling
Program Type	7-Day Programmable, Manual / Not Programmed
Energy Star Certified	Yes
Power Supply	Thermostat--Battery Powered
Frequency	50 Hz, 60 Hz
Number of Batteries	1
Battery Size	CR2032
Battery Type	Lithium Ion
Warranty	5 Years
Includes	THX9421R5021WW Prestige® 2-Wire IAQ Thermostat, THM5421R1021 Equipment Interface Module, 2 Duct Sensors
For Use With	RedLINK® accessories
Communication Type	RedLINK, WiFi
Product Height	3.56 in, 91 mm
Product Width	5.81 in, 147 mm
Product Depth	1.5 in, 38 mm
UPC	085267336451

YTHX9421R5085WW has been discontinued by the manufacturer (2026-09). Suggested replacement: YTHX1200W7 - ElitePRO S1200 Smart Thermostat EIM Kit, White.

Prestige 2-wire IAQ kit with RedLINK technology for residential or commercial use, 7-day programmable, up to 4H/2C heat pump or 3H/2C conventional.

Features

Large display size 5.09 sq. in

Specifications

Brand: Resideo (Honeywell Home)
Manufacturer Part #: YTHX9421R5085WW/U
Application: Conventional Systems, Heat Pumps with Auxiliary Heat
Thermostat Type: Programmable, Digital, Low Voltage, RedLINK
Stages: Up to 4 Heat/2 Cool Heat Pump Systems, Up to 3 Heat/2 Cool Conventional Systems
Smart Home Integration: No
Display Type: Touch Screen
Display Size: 8.06 sq in
Touchscreen: Yes
Display Language: Display selectable for English, French, or Spanish
Modes of Operation: Heating, Cooling
Program Type: 7-Day Programmable, Manual / Not Programmed
Energy Star Certified: Yes
Heat-Cool Changeover: Auto, Manual
Power Supply: Thermostat--Battery Powered
Frequency: 50 Hz, 60 Hz
Number of Batteries: 1
Battery Size: CR2032
Battery Type: Lithium Ion
Warranty: 5 Years
Includes: THX9421R5021WW Prestige® 2-Wire IAQ Thermostat, THM5421R1021 Equipment Interface Module, 2 Duct Sensors
For Use With: RedLINK® accessories
Communication Type: RedLINK, WiFi
WiFi: No
WiFi Specifications: Internet Gateway THM6000R7001/U Provides WiFi Capabilities
Z-Wave: No
Z-Wave Specifications: Not Applicable
RedLINK: Yes
Color: Front: White, Side: White
Sensor Type: Thermistor
Ambient Operating Temperature (Max): 120 °F, 49 °C
Ambient Operating Temperature (Min): 32 °F, 0 °C
Backlight Options: Adjustable
Fan Function: On, Auto, Circulating
Clock Type: Year Clock
Demand Response: No
Mounting Type: Horizontal Mount
Number of Fan Speeds: 1
Product Height: 3.56 in, 91 mm
Product Width: 5.81 in, 147 mm
Product Depth: 1.5 in, 38 mm
Hazmat Information: LITHIUM METAL BATTERIES in compliance with Section II of PI970
Features: ENERGY STAR Certified, Smart Response
UPC: 085267336451
Country of Origin: MX
Category: Programmable Thermostats