Can it be used with a heat pump?
The 70 economy series White-Rodgers 1E78-144 can be used for heat pump system and is non-programmable and must be hardwired.

70 Series thermostats are the height of residential single stage and heat pump applications. The perfect upgrade for mechanical thermostats, the 70 series will cover wall marks left by most mechanical models without the need for an extra wall plate.
Product Features:
White-Rodgers is the world’s leading provider of heating, ventilation, air conditioning, and refrigeration solutions for residential, industrial, and commercial applications. Combining technically superior products and services from industry-leading divisions and brands with global engineering, design, distribution, installation, and monitoring capabilities help White-Rodgers to create reliable, energy efficient climate systems that improve human comfort, safeguard food, and protect the environment.
This product is listed under the following manufacturer number(s):
*Denotes a finish or option that has been discontinued
The 70 economy series White-Rodgers 1E78-144 can be used for heat pump system and is non-programmable and must be hardwired.
The White-Rodgers 1E78-144 should have a lip on the side or in the back that slides open. That panel will give you access to the batteries. You may need to remove it from the wall to change them.
Instructions for the White-Rodgers 1E78-144 can be found on the following link; http://www.emersonclimate.com/Documents/White-Rodgers/instruction_sheets/0037-6599.pdf
The White-Rodgers 1E78-144 should have a lip on the side or in the back that slides open. That panel will give you access to the batteries. You may need to remove it from the wall to change them.
| Voltage | 24 |
|---|---|
| Terminals | RC, RH, W, Y, G, O, B |
| UL Listed | No |
| Stages | 1 Heat / 1 Cool |
| Height | 5.3 |
| Settings | 3 |
| Temperature Range | 45 to 90 Degrees F |
| Application | Electric, Gas, Oil |
| Control Type | Electronic |
| ADA | Yes |
| Width | 3.25 |
| Supports Millivolt | Yes |
| Eco Friendly | No |
| System Switch | Heat, Off, Cool |
| Amperage | 1.5 |
| Power Source | B |
| Fan Switch | Auto, On |
| Depth | 1.1 |
| Hardwired | No |
| Supports 24 Volts | Yes |
| Backlit | Yes |
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