Honeywell T4 Pro Thermostat Top Quality Brand Name Products

Honeywell T4 Pro Thermostatthermostat

The T Series programmable thermostat streamlines everything from product selection and installation to customer service and support. With a standard footprint and simple interface, the T Series will enhance the entire thermostat experience for you and your customers alike.


  • TH4210U2002 2H/1C heat pump and 1H/1C conventional
  • TH4110U2005 1H/1C heat pump and 1H/1C conventional
  • 7-day, 5-2, 5-1-1 or non-programmable
  • Uses the UWP mounting system that’s standard across all T Series thermostats
  • Simple push-button functionality
  • Filter change reminders
  • 5-year warranty

The T4 has simple programmable comfort control.

Specification In Detail


  • 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

Dimensions (in.)

  • 4-1/16 in. long x 4-1/16 in. wide x 1-3/32 in. deep

Dimensions (mm)

  • 103.6 mm long x 103.6 mm wide x 28 mm deep


  • Thermostat, UWP mounting system, Installation (J-box) adaptor,

Item Type

  • Product


  • UWP Mounting System

Electrical Ratings

  • 20 to 30 Vac


  • 50 Hz; 60 Hz


  • Up to 1 Heat/1 Cool Heat Pumps; Up to 1 Heat/1 Cool Conventional Systems

Electrical Connections

  • Honeywell UWP Mounting System

Operating Humidity Range (% RH)

  • 5 to 90% RH, non-condensing

Supply Voltage

  • 20 to 30 Vac

Switch Positions (System)


Switch Positions (Fan)


Operating Temperature Range (F)

  • 37 F to 102 F

Operating Temperature Range (C)

  • 2.7 C to 39 C

Shipping and Storage Temperature Range (F)

  • – 20 F to 120 F

Shipping and Storage Temperature Range (C)

  • – 28.9 C to 48.9 C


  • LED Back Light

Power Method

  • Battery or Hardwired

Accuracy (C)

  • 0.5 C

Differential Temperature (F)

  • ± 1 F

Differential Temperature (C)

  • ± 0.5 C


  • White

Ambient Temperature Range (F)

  • 32 F to 120 F

Ambient Temperature Range (C)

  • 0 C to 50 C

Switch Type

  • Relay


  • 7 day, 5-1-1 day, 5-2 day, or Non-programmable


  • Medium display, Soft Key Controls

Display Size

  • 3.93

Temperature Control Mode Selections

  • Ambient Air Temperature


  • Auto or Manual

Setting Temperature Range (F)

  • Heat: 40 F to 90 F; Cool 50 F to 99F

Setting Temperature Range (C)

  • Heat: 4.5 C to 32.0 C; Cool: 10 C to 37.0 C

Cool Current

  • 0.02 A to 1.0 A running

Heat Current

  • 0.02-1.0 A

Fan Current

  • 0.02-.05 A


Rave Reviews from Happy Customers

  • “I really appreciate the prompt service, knowledgeable technicians and professionalism. They were very thorough. I have been with Bob's for years and they've never let me down.”

    - Kim S.
  • “Bob's did a great job! They did everything they promised in the time they said they would. We needed a new furnace and air conditioner. Very Happy!”

    - Julie C.
  • “Professional & Excellent Service”

    - Annette P.
  • “Great service and very professional servicemen. It's always a pleasure dealing with Bob's Heating & Air”

    - Douglas W.
  • “Excellent company!! Rachel Z really helped me and was not pushy, but really made sure I understood everything and we got the AC installed with the air scrubber!! Thank you, Bobs”

    - Kevin R.