This Lennox-branded Honeywell THX9421R5085WW thermostat delivers advanced comfort control with a full-color touchscreen interface and integrated RedLINK wireless capability. Designed to support both heat pump and conventional systems, it offers precise scheduling, enhanced temperature management, and compatibility with RedLINK duct sensors for improved airflow and equipment protection. Ideal for residential and light commercial applications seeking reliable, high-performance HVAC control.

Features include support for heat pump systems up to 4 heat/2 cool and conventional systems up to 3 heat/2 cool. The intuitive interface simplifies programming, while RedLINK wireless communication provides flexible installation options and remote diagnostics when paired with additional RedLINK accessories. Its advanced sensing and smart control logic help maintain stable indoor temperatures and support long-term system efficiency.

 

Specifications:

 

Model: Honeywell THX9421R5085WW (Lennox Y6955)
System Compatibility:
• Heat Pump: Up to 4 Heat / 2 Cool
• Conventional: Up to 3 Heat / 2 Cool
Display: Full-color touchscreen
Communication: RedLINK wireless technology
Included Sensors: RedLINK duct sensors (supports supply/return monitoring)
Programming: 7-day programmable, temperature scheduling
Power Requirements: 24 VAC, 50/60 Hz
Stages Supported: Multi-stage heating and cooling
Mounting: Wall mount, low-profile design
Operating Temperature Range: 32°F to 120°F (0°C to 48.9°C)
Humidity Operating Range: 5% to 90% RH, non-condensing
Dimensions (Thermostat):
• Height: 4.5 in
• Width: 6.0 in
• Depth: 1.0 in
Communication Range: Up to 200 ft (line of sight) with RedLINK

Accessories Supported:

• RedLINK Equipment Interface Module
• RedLINK Internet Gateway
• Portable Comfort Control
• Wireless Duct Sensors
Use Case: Residential and light commercial HVAC control