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Honeywell Programmable Thermostat RTH6450/RET95E Manual

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Honeywell Programmable Thermostat Owner’s Manual

Honeywell Programmable Thermostat RTH6450/RET95E photo

Honeywell Programmable Thermostat Owner’s Manual

This is a legacy product document supported by Resideo. It is no longer manufactured

Read and save these instructions.

For help please visit: yourhome.honeywell.com

Installation is Easy

  1. Label wires and remove your old thermostat
  2. Install and wire your new thermostat
  3. Set your new thermostat to match your heating/cooling system
  4. It is preset for the most common system

Do you need assistance? We are here to help.

Support staff photo

Call 1-800-468-1502 for wiring assistance before returning the thermostat to the store.


No emrcury warning

This product does not contain mercury. However, this product may replace a product that contains mercury. Mercury and products containing mercury should not be discarded in household trash.

For more information on how and where to properly recycle a thermostat containing mercury in the United States, please refer to the Thermostat Recycling Corporation at www.thermostat-recycle.org.

For mercury thermostat recycling in Canada, please refer to Switch the Stat at www.switchthestat.ca

Turn Off Power to Heating/Cooling System

Circuit breaker box diagram

Remove Old Thermostat

Remove old thermostat but leave wallplate with wires attached.

Removing the old faceplate

Label Wires with Tags

Label the wires using the supplied wire labels as you disconnect them.

Wire labelling table

Wire labels example

Separate Wallplate from New Thermostat

Remove wallplate from the new thermostat and mount onto wall.

Removing the wallplate


Mount Wall plate

Mount the new wall plate using the included screws and anchors.

Mounting the wallplate

  1. Drill 3/16-in. holes for drywall
  2. Drill 3/32-in. holes for plaster

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