Resideo - Honeywell Home YTHX9421R5101WW Thermostat Kit

Resideo - Honeywell Home YTHX9421R5101WW Thermostat Kit is a versatile 2‑wire thermostat designed for a 7‑day programmable thermostat or non‑programmable operation. It supports 4‑Heat/2‑Cool (heat pump) or 3‑Heat/2‑Cool (conventional) configurations with Auto/Manual Changeover to match your schedule and comfort needs.

Operated as a hardwired thermostat, it runs on 18–30 VAC at 50/60 Hz and fits in a compact white enclosure with an 8.06 square inch display for quick temperature checks. Temperature ranges cover 32–120°F ambient, with heat setpoints from 40–90°F and cool setpoints from 50–99°F, giving precise control in diverse climates.

Its flexible wiring supports a wide range of systems with terminals such as R, RC, RH, C, W-O/B, Y, G, and more.

• 7‑day programming or non‑programmable mode to fit your schedule.
• Heat pump and conventional system support with 2‑wire compatibility for flexible installation.
• Auto/Manual Changeover for optimal comfort and energy efficiency.
• Hardwired power (18–30 VAC, 50/60 Hz) ensures reliable performance.
• Large white display (8.06 in²) with clear temperature readouts; wide 32–120°F range and 40–90°F heat, 50–99°F cool setpoints.