WHITE RODGERS 01E78 144 Thermostat 1H 1C 24VAC

Thermostat for single-stage heat and cool

The White Rodgers 01E78 144 is a non-programmable low-voltage thermostat designed for residential and light commercial systems. It controls one heating stage and one cooling stage with a simple manual interface. The unit is compatible with electric forced-air furnaces, gas forced-air furnaces, heat pumps with auxiliary heat, and millivolt systems. It suits installers and homeowners who need basic temperature regulation without scheduling features.

Steady operation across the control range

The thermostat maintains an adjustable differential to reduce short-cycling during extended heating or cooling calls. Its temperature control span runs from 45 degrees F to 99 degrees F, allowing consistent performance through seasonal extremes. Dual transformer compatibility ensures stable power delivery when separate heating and cooling transformers are present. The slide switch provides positive off and auto-on fan settings for continuous air circulation when required.

Limits of the 24VAC low-voltage interface

The device operates on 24VAC power with battery backup for memory retention during outages. It does not support humidification or dehumidification control modules. The manual interface lacks programmability, so users requiring scheduled setback must choose a different model. Wiring is limited to single-stage conventional and heat pump configurations, excluding multi-stage or communicating equipment.