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White rectangular thermostat with digital display and buttons

White-Rodgers 1F78-144 70 Series Non-Programmable HVAC Control

SKU CH-FPPS-A7AQD MPN 1F78-144

A non-programmable thermostat with a backlit digital display for single-stage heating, cooling and heat-pump systems, offering ±1°F precision on 24-volt or millivolt circuits

  • Rated voltage125VAC
  • Mounting styleWall Mount
  • Relay contact70 Series, 24 V
  • Certifications and standardsNot capable emitting RF energy
  • Product typeManual, Electronic
  • Size or dimensions1.75 in × 6.25 in × 4.25 in
  • Easy-to-read digital display with backlight for clear visibility
  • Non-programmable operation simplifies daily temperature control
  • Compatible with single-stage heating, cooling and heat pump systems
  • Precision control within plus/minus 1° F maintains comfort
  • Millivolt compatible for wider installation options

Non-Programmable HVAC Control

The White-Rodgers 1F78-144 is a manual electronic thermostat designed for residential and light commercial HVAC systems. It provides simple temperature regulation without scheduling features. This unit suits installers or owners who prefer direct, basic control over heating and cooling equipment.

Low-Voltage Relay Operation

The thermostat operates on a 24-volt relay contact and is also millivolt compatible. It requires a 125VAC supply for the display and internal electronics. Power draw and acoustic noise are negligible during normal wall-mounted operation.

Single-Stage System Compatibility

This model works with single-stage heating, cooling, and heat pump systems that do not use auxiliary heat. It is not compatible with electric baseboard heat or multi-stage configurations. Buyers needing programmable schedules or multi-stage support should select a different control.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $37.99
Cheaper than about 56% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameWhite-Rodgers, Copeland
Model name1F78-144
Part number1F78-144
Product typeManual, Electronic
Product colorWhite
Power
Rated voltage125VAC
Size & build
Size or dimensions1.75 in × 6.25 in × 4.25 in
Mounting styleWall Mount
In the box
Number of items12 pack
Environment & compliance
Certifications and standardsNot capable emitting RF energy
More details
Relay contact70 Series, 24 V

Questions about this item

How do I wire this thermostat to a 24-volt system, and which terminal mistake causes no heat?

Connect the 24-volt transformer wires to R and C, then link heating to W and cooling to Y; swapping R and C leaves the display dark and the relay inactive.

What part will need replacement after several years of daily cycling?

The internal 70 Series relay contacts rated for 24 volts can wear from repeated switching, eventually causing intermittent operation.

At what point does the display backlight become hard to read during continuous operation?

The backlight stays on while 125VAC power is present, so readability only drops if the supply voltage sags or the display itself ages.

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