White-Rodgers 1E78 Vertical Single Stage 1H/0C Thermostat - 1E78-140

White-Rodgers 1E78 Vertical Single Stage 1H/0C Thermostat - 1E78-140

Restore accurate room-temperature control with this White-Rodgers 1E78 Vertical Single Stage 1H/0C Thermostat - 1E78-140. This wall thermostat monitors indoor temperature and cycles compatible heating and cooling equipment on and off to maintain the set point.

1E78-140 is a thermostat selected by system type, staging, voltage, and terminal configuration rather than by appearance alone. Replace it when the original control drifts out of calibration, stops responding correctly, or no longer maintains a steady room temperature.

Compatibility: This is an HVAC control matched by system type, heat/cool staging, voltage, and terminal layout rather than by appliance model number alone.

Fitment / What To Verify: Verify system voltage, heating/cooling stages, mounting orientation, and terminal layout before ordering.

Please confirm fitment with your appliance model number before ordering.

Is it time to replace?

• Common Symptoms: Inaccurate room temperature, short cycling, no call for heating or cooling, or unresponsive controls.
• Visible/Sensory Cues: Blank or erratic display, worn buttons, inaccurate temperature readings, or mismatched terminal labels during replacement.

Pro Tip: Photograph the original thermostat wiring before removal and verify terminal names and system staging before installing the new control.

Technical Specifications