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White rectangular programmable thermostat with medium display and push-button controls

Honeywell TH4210U2002 T4 Pro Programmable Thermostat 2H/1C 1H/1C

SKU CH-6T21-0JPZ6

A programmable thermostat supporting two heating and one cooling stage with a UWP mounting system and filter-change reminders

  • Product typeProgrammable
  • Product colorWhite
  • Key featuresProgrammable
  • Programmable scheduling adapts heating and cooling to daily routines
  • UWP mounting system fits existing T Series installations without rewiring
  • Push-button controls with LED backlight give clear visibility in low light
  • Filter change reminders protect HVAC efficiency and indoor air quality
  • Includes thermostat, mounting system and J-box adapter for complete setup

Honeywell T4 Pro Programmable Thermostat

The Honeywell T4 Pro is a programmable thermostat designed for residential heating and cooling control. It supports both 2H/1C and 1H/1C system configurations, offering flexibility for conventional and heat pump setups. The unit features a white finish with a medium display, LED backlight, and soft key controls for straightforward operation.

Suits homes needing flexible stage control

This thermostat suits homeowners who want programmable scheduling with filter change reminders and a standard UWP mounting system. It is not for installations requiring built-in Wi-Fi connectivity, humidity control, or multi-zone management from a single unit. Buyers needing smart home integration or remote app access should consider other options.

Dual 2H/1C and 1H/1C compatibility

The decisive specification is the dual compatibility with two-stage heat/one-stage cool and single-stage heat/cool systems. This determines whether the thermostat matches the existing HVAC equipment. Verify the system type before purchase to ensure correct wiring and operation.

How it compares

Measured against everything we stock in Thermostats & Thermostat Accessories, at today’s prices. Recalculated every night.

Price $87.99
Pricier than about 54% of the 286 comparable items (median $78.49).

Specifications

Product
Brand nameHoneywell
Product typeProgrammable
Product colorWhite

Questions about this item

How much heat does the TH4210U2002 generate when running all day?

The T4 Pro uses very little power and produces no noticeable heat during continuous operation.

What existing wiring or system is required to install the TH4210U2002?

It works with standard 2H/1C heat pump or 1H/1C conventional systems and includes a J-box adapter for common wall boxes.

Will the UWP mounting system on the TH4210U2002 fit the wall plate from an older T Series thermostat?

Yes, the UWP mounting system is standard across all T Series models, so existing T Series wall plates are compatible.

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