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  • Easy to read backlit display with soft-touch button interface
  • Quality Temperature Control for Heat Pump with Auxiliary Heat
  • Mercury free thermostat
  • Compatible with Heating and Cooling/Heat Pump with Electric Backup
  • Does NOT work with Electric Baseboard Heat (120-240V), Heat Pumps with Gas Backup or Multi-Stage Heating/Cooling

The Honeywell RTH3100C1002/A Digital Heat/Cool Pump Thermostat has been redesigned to offer users peak performance in an incredibly simple and intuitive manner. Select your heating and cooling preferences with absolute precision with this digital thermostat's highly responsive and intuitive design. Featuring a green backlit screen and a soft-touch button interface, the controls have been modified in an effort to make this thermostat the absolute height of accessibility. Should the power in your home ever give out, the RTH3100C1002 will employ an intuitive technology that will allow it to remember all of your previous settings. The digital heat/cool pump thermostat will continue to function normally once power is restored.

The Honeywell RTH3100C1002/A Digital Heat/Cool Pump Thermostat is compatible with Heating and Cooling Heat pumps with electric backup.

  • Single-Stage Heating and Cooling: No
  • Multi-Stage Heating and Cooling: No
  • Heating Only: Yes
  • Cooling Only: Yes
  • Compatible with Warm Air Furnace: No
  • Compatible with Central Air Conditioning: No
  • Compatible with Heat Pump (No Aux./EM): No
  • Compatible with Heat Pump (With Aux./EM): Yes
  • Compatible with Hot Water: No
  • Compatible with Steam or Gravity: No
  • Use with Floor/Wall Furnace 24V or 750mV: No
  • Use with Volt Gas Fireplace 24V or 750mV: No
  • Use with Pellet Stove for mV Thermostats: No
  • Use with Electric Baseboard 120V-240V: No
Product Details
Product Specs
Product Manuals
Honeywell RTH3100C1002/A Digital Heat/Cool Pump Thermostat Video

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RTH3100C1002/A customer reviews

Overall Rating

10 Reviews
10 customers recommend this product
Honeywell RTH3100C1002/A Digital Heat/Cool Pump Thermostat Reviews
Jonathan Tobey
October 7, 2019
Verified Purchase
Simple to use

This thermostat is one of our best sellers in our heat and air business. Customers love the simple, easy to use controls, and easy-to-read screen. It's especially popular with our elderly customers.

Shana Pratt
July 28, 2019
Verified Purchase

Exactly what I ordered thank you

Charles Zerbe
July 9, 2019
Verified Purchase
Great thermostat

Great thermostat easy to follow instructions well made highly recommend or buy again

Donald McBurney
August 3, 2018
Verified Purchase
Thermostat for Heat Pump

I wanted a thermostat that was a little more modern than my 25-yr-old mercury bulbs which still worked great so bought a Honeywell at Home Depot only to find out that it would not work with my Heat Pump which has Emergency Heat. So I went off to a variety of websites and found the description of the Honeywell RTH3100C1002/A seeming to be exactly what I needed. After checking some prices elsewhere, Honeywell came up with the best. Shipped quickly and the installation was almost a breeze. Turns out I had a T wire in the old thermostat which I didn't know where to connect. A quick call to Honeywell got a very astute technician who said I didn't need the T wire in the new thermostat. Tape it off and let it hang in the wind. Connected all the others per instructions and the new thermostat looks and works great. Total removal of old and installation of new took about an hour total including the technician call and working with small wires and screws when my hands are made for much bigger things.

scott weldon
July 24, 2017
Verified Purchase

works great. Easy to install.

James Wilson
April 6, 2016
Verified Purchase


William Roop
May 28, 2015
Verified Purchase

Currently have two heat pumps at my home, one of which has the Honeywell thermostat. I like the Honeywell thermostat as it's much easier to read, see and set. This is why I purchased this second thermostat to replace the existing thermostat.

dave Marshall
February 5, 2014
Verified Purchase
Installed and worked perfectly

It installed and worked perfectly

Lawrence Donohoe
January 21, 2014
Verified Purchase
Works fine, once connected right.

Device works as advertised. I replaced 2 Trane Weathertron mercury bubble thermostats. The wiring was a problem. Two calls to customer support got two different answers - both wrong! I had to replace fuses on the air handler until my local HVAC guy told me the correct connections.

Mark Loring
November 30, 2011
Easy to use

Easy to use, works great. Good quality and value

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