Name: Honeywell Home TH4210U2002/U T4 Pro Programmable Thermostat with Stages up to 2 Heat/1 Cool Heat Pumps; up to 1 Heat/1 Cool Conventional Systems
Brand: Honeywell Home
SKU: HONE-TH4210U2002/U
Price: 76.99 USD
Availability: OutOfStock

Resideo T4 Pro Programmable Thermostat with stages up to 2 Heat/1 Cool Heat Pumps; up to 1 Heat/1 Cool Conventional Systems

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Supply Voltage	20 to 30 Vac
Frequency	50 Hz; 60 Hz
Electrical Connections	Honeywell UWP Mounting System
Electrical Ratings	20 to 30 Vac
Operating Temperature	37 F to 102 F
Ambient Temperature	32 F to 120 F
Operating Humidity	5 to 90% RH, non-condensing
Mounting	UWP Mounting System
Application	Standard Efficient Gas Forced Air, High Efficacy Gas Forced Air, Oil Forced Air, Electric Forced Air, Hot water Fan Coil, Geothermal Heat Pump, Air to Air Heat
Includes	Thermostat, UWP mounting system, Installation (J-box) adaptor
Dimensions	4-1/16 in. long x 4-1/16 in. wide x 1-3/32 in. deep
Hazmat Information	NOT RESTRICTED - SPECIAL PROVISION A123
Stages	Up to 2 Heat/1 Cool Heat Pumps; Up to 1 Heat/1 Cool Conventional Systems
Switch Positions (System)	HEAT-OFF-COOL-AUTO-EM HEAT
Switch Positions (Fan)	AUTO-ON
Shipping and Storage Temperature Range (F)	- 20 F to 120 F
LEDs	LED Back Light
Power Method	Battery or Hardwired
Color	White
Display	Medium display, Soft Key Controls
Accuracy (F)	1 F
Differential Temperature (F)	± 1 F
Switch Type	Relay
Programmability	7 day, 5-1-1 day, 5-2 day, or Non-programmable
Display Size	3.93 sq.in.
Temperature Control Mode Selections	Ambient Air Temperature
Changeover	Auto or Manual
Setting Temperature Range (F)	Heat: 40 F to 90 F; Cool 50 F to 99F
Cool Current	0.02 A to 1.0 A running
Heat Current	0.02-1.0 A
Fan Current	0.02-.05 A

TH4210U2002 has been discontinued by the manufacturer (2026-04). Suggested replacement: TH6210U2001 - T6 Pro Programmable Thermostat, 2H/1C Heat Pump, 1H/1C Conventional.

The Honeywell Home TH4210U2002/U is a T4 Pro wall thermostat. It is rated for up to 2 heat and 1 cool on a heat pump, and up to 1 heat and 1 cool on a conventional system.

Programmable. Setback on a schedule is where the savings actually come from on a system that runs daily. If the building empties on a predictable pattern, the schedule pays for the difference in price over a non-programmable unit; if it does not, it will not.

Where it sits in the range. Resideo builds these in tiers, and the tier number is the amount of control you get, not the build quality. T1 and PRO 1000 are single-stage and non-programmable — set it and leave it. T3 and PRO 3000 add a digital display and more staging. T4 and PRO 2000 add scheduling. T6 covers multi-stage and heat pump work, with a Smart version that adds Wi-Fi. T10 Pro is the top of the line, with RedLINK and remote room sensing. PRO 1000, PRO 2000 and PRO 3000 are the older names for the same tiers as T1, T4 and T3 — if you are matching what came out of the wall, the PRO number and the T number can be the same generation of product under two labels.

Before you order. Match the thermostat to the equipment, not to the room: count the heating and cooling stages the system actually has, and confirm whether it is a heat pump or a conventional system, because the two wire differently at the thermostat. A unit rated for more stages than you have will work; one rated for fewer will not run the equipment you own. If you are replacing a Honeywell Home unit, the part number carries over — Honeywell Home thermostats are made by Resideo, and the legacy numbering is the same.

Brand: Honeywell Home
Manufacturer Part #: TH4210U2002/U
UPC: 085267187336
Category: Thermostats

Full Specifications

Thermostat Type	Digital; Low Voltage; Programmable; Heatpumps Thermostat
WiFi	No
Color	White
Includes	T4 Pro Thermostat; UWP Wall Plate; Decorative Cover Plate; Screws and anchors; 2 AA Batteries; Literature
Stages	Up to 2 Heat/1 Cool Heat Pump Systems; 1 Heat/1 Cool Conventional Systems
Modes of Operation	Heat; Cool
Program Type	5-2 Programmable; 7-Day Programmable; 5-1-1 Programmable; Scheduled Disabled
Alerts and Reminders	Battery Replacement; Filter Change
Displayed Information	Time; Mode; Indoor Temperature; Status Display; Backlit
Energy Star Certified	No
Features	Adaptive Intelligent Recovery; Backlit Display
Power Source	Hardwired; Battery Operated
Product Height	4.06 in; 104 mm
Product Width	4.06 in; 104 mm
Product Depth	1.09 in; 28 mm