Part of Honeywell/Resideo’s contractor-friendly T Series, the T4 Pro TH4210U2002 delivers straightforward comfort control in a compact, familiar footprint. Its intuitive interface simplifies installation and daily use, while flexible staging supports a wide range of residential HVAC systems.
Key Benefits
Versatile compatibility
Controls up to 2 Heat / 1 Cool heat-pump systems or 1 Heat / 1 Cool conventional equipment.
User-friendly programming
Clear menus and push-button navigation make it easy for homeowners to create energy-saving schedules.
Standardized mounting
The UWP™ universal wall plate speeds change-outs and keeps wiring consistent across the entire T Series.
Adaptive Intelligent Recovery (AIR)
Learns run-times and starts early so the space reaches setpoint at the exact schedule time—better comfort, no extra programming.
Auto or manual change-over
User (or ISU) can let the stat switch between heat & cool automatically on shoulder-season days, or lock modes for testing/balancing.
Wire-saver & rich terminals
R, RC, C, W, O/B, Y, G, L plus “K” terminal allow the THP9045 wire-saver module—handy when the C-wire is missing.
Contractor-grade design
Sturdy construction, battery-or-C-wire power options, and easy-access terminals reduce installation time and callbacks.
Seamless aesthetics
A slim profile and included decorative cover plate hide drywall marks for a clean, professional finish.
Other Features:
Wide operating envelope
Designed for 37 – 102 °F ambient & 5 – 90 % RH (non-condensing)—safe for attics, garages, and unconditioned closets.
5-year Honeywell warranty
Long coverage and nationwide parts availability reassure contractors and property managers alike.
What’s in the Box?
- T4 Pro thermostat
- UWP™ mounting system
- Standard J-box adapter
- Decorative cover plate (121 mm × 121 mm × 9 mm)
- Screws, anchors, and 2 AA batteries
- Installation instructions and user guide
