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Honeywell Home Prestige IAQ Kit (YTHX9421) is no longer available

This listing is kept for historical reference. Scores and comparisons have been removed.

Honeywell Home Prestige IAQ Kit (YTHX9421)

by Honeywell Home (Resideo)

Highlights

About This Product

Honeywell Home Prestige IAQ Kit (YTHX9421) is a smart thermostat with Wi-Fi connectivity.

Tool Specifications

Warranty
1 year
Connectivity
Wifi
Mobile App

Thermostat Capabilities

Communication
24V via Equipment Interface Module (EIM, THM5421R1021); device comms over RedLINK proprietary wireless
Communicating Compatibility
OEM-agnostic/universal (conventional up to 3H/2C, heat pump up to 4H/2C); not tied to a single OEM communicating bus — uses Honeywell RedLINK accessory ecosystem
C-Wire
2-wire capable ("2-Wire" IAQ kit); EIM handles wiring/power, reducing C-wire need at thermostat
Zoning
Not a zoning panel; integrates with Honeywell TrueZONE/RedLINK zoning accessories
IAQ Sensors
IAQ control kit: three sets of universal IAQ contacts (humidify/dehumidify/ventilate); includes wireless outdoor sensor (C7089R1013) and two duct sensors
BMS / BACnet
None — no BACnet/BMS integration; standalone residential/light-commercial controller
Dealer Portal
Resideo Pro / customer.resideo.com (HonECC Catalog)
Pro Features
EIM for advanced/2-wire wiring; contractor contact details on screen; Delta T diagnostics; 4H/2C heat pump & 3H/2C conventional staging; universal IAQ contacts; RedLINK accessory ecosystem; color HD touchscreen; +/-1F precision

FSH Score Breakdown

Score Pending

This product has not yet been scored against our methodology. Check back soon.

Customer Reviews

Pricing

Model
Custom
Starting at
$300
Notes
$300 - $450 (kit, est.)
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