Resideo - Honeywell Home THX9421R5021WW Thermostat

The THX9421R5021WW thermostat from Honeywell Home (Resideo) delivers precise climate control for your home. This wireless thermostat offers 7‑Day Programmable/Non‑Programmable operation to fit your schedule and energy goals.

It supports both heat pump and conventional systems with 4‑Heat/2‑Cool (heat pump) or 3‑Heat/2‑Cool (conventional) configurations, plus Auto/Manual Changeover for seamless transitions between heating and cooling.

It features a white finish and a large 8.06 square inch display. The unit uses low voltage 18–30 VAC at 50/60 Hz and installs in a compact 4-1/2" W x 7/8" D x 3-1/2" H housing. Operating ambient temperature runs from 32 to 120°F, and the setting temperature ranges are 40–90°F for heat and 50–99°F for cool. Humidity tolerance is 5–90% relative humidity (non-condensing).

It connects to your equipment via R, C terminals and RedLINK to the Equipment Interface Module, delivering reliable wireless performance and simple setup.

• 7‑Day programmable or non-programmable operation
• Wireless thermostat with RedLINK connection
• Supports heat pump (4-Heat/2-Cool) or conventional (3-Heat/2-Cool) systems
• Auto/Manual Changeover for easy mode switching
• Large 8.06 in² display in a white finish
• Low-voltage 18–30 VAC, 50/60 Hz supply
• Temperature range: 40–90°F (heat), 50–99°F (cool)
• Operating range: 32–120°F and humidity 5–90% RH (non-condensing)
• Terminals: R, C and RedLINK to Equipment Interface Module