White-rodgers 01F78 144S1 Digital Thermostat 1H 1C

Product Description

The WHITE-RODGERS 01F78 144S1 is an economy digital single stage thermostat designed for straightforward residential and light commercial HVAC control. Battery powered and self-contained, it operates across a control range of 45 to 99 degrees F, supporting millivolt (mV) systems up to 30 volts with electronic switching. The single stage, 1 heat / 1 cool configuration makes it a practical replacement or upgrade in systems that do not require multi-stage or heat pump logic. Licensed HVAC technicians and qualified installers are the typical end users for this control.

This thermostat is suited for single stage forced-air heating and cooling systems in residential settings. Its battery-powered design eliminates the need for a common (C) wire, making it a workable fit in older systems or retrofits where low-voltage wiring is limited. The wide voltage range, from millivolt up to 30 volts, extends compatibility to standing-pilot gas appliances and other mV-based systems in addition to standard 24-volt HVAC equipment.

Key Features

• Battery powered operation — no C wire required
• Control range of 45 to 99 degrees F
• Compatible with millivolt (mV) through 30-volt systems
• Electronic switching for reliable, low-maintenance operation
• Single stage 1 heat / 1 cool configuration
• Economy digital display for straightforward temperature management

Compatibility

Designed as an OEM-style replacement for single stage residential heating and cooling systems operating on millivolt through 30-volt circuits, including standing-pilot gas appliances and standard 24-volt HVAC systems.

Installation Notes

Installation is typically performed by a licensed HVAC technician. Power down or shut off the HVAC system at the disconnect or breaker before disconnecting the existing thermostat or making any wiring connections. Follow local codes and the NEC for low-voltage control wiring. Verify system voltage compatibility with the mV to 30-volt operating range before energizing.