Does the display light up as shown in the description? That would make it easier to read.

Look at Answer 1 (Maina, answered on December 13, 2015). YES, it has a backlight! I just followed these instructions on my newly-installed thermostat, and it lights up beautifully.

I followed the instructions to turn the backlight on. it worked first day but then stopped working. so i followed instructions again. why it stopped?

You probably didn't turn the 'Heat on/off' button to 'off' after setting the backlight to on. The process is: 1. Switch bottom button to 'Heat'. Press up and down arrows at same time for 2 seconds. Display alternates with FF and L flashing. 2. Push 'Up' or 'Down' button to select FF. 3. Now, make sure you set the bottom button to 'Off' to make the backlight setting permanent. Backlight will come on now whenever you press the up or down arrow buttons. Goes off after a few seconds if the buttons aren't being depressed.

can i use it in an rv with a 12 (2 wire) volt system?

If it’s just heat only you can use it but if you have a duct system with ac and heat you cannot use it

Will this work with a Cozy gas wall heater that uses 2 wires?

From what i learned back when i did my research is a 2 wire system will work with any 2 wire thermostat. ..it worked on mine and works perfect...and saves me on my gas bill...if your still unsure i would recommend calling the manufacturer...good luck

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Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat for Single-Stage Systems, White

Product ID: 19299902

Details

Brand
White-Rodgers
Controller Type
Hand Control
Model Name
1E78-140
Product Dimensions
30"D x 8"W x
Special Feature
Easy to Read

💡Backlit digital display

🔋Battery powered (3 AAA included)

🌡️±1°F precision control

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Description

🌡️ Stay warm, stay precise—comfort that’s always in your control.

CRYSTAL CLEAR DISPLAY - Backlit digital screen ensures effortless reading day or night, because your comfort deserves clarity.
RELIABLE BATTERY POWER - Comes with 3 AAA batteries included for uninterrupted control, even during power outages.
SLEEK VERTICAL PROFILE - Modern, space-saving design that blends into your wall with a matte white finish—style meets function.
EFFORTLESS COMPATIBILITY - Seamlessly integrates with single-stage heat-only systems—plug and play simplicity for your home.
PRECISION TEMPERATURE MASTERY - Maintain your comfort with ±1°F accuracy—no more guessing, just perfect warmth.

The Emerson 1E78-140 is a non-programmable, battery-powered thermostat designed for single-stage heat-only systems. Featuring a backlit digital display and ±1°F temperature accuracy, it offers precise manual control in a sleek, vertical profile. Easy to install and compatible with 24-volt and millivolt systems, it ensures reliable heating management without smart home complexity.

Specifications

ASIN	B00204WWGE
Additional Features	Easy to Read
Backlight	Yes
Best Sellers Rank	#51,062 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #26 in Home Nonprogrammable Thermostats
Brand Name	White-Rodgers
Color	White
Connectivity Protocol	BACnet MS/TP
Connectivity Technology	Wired
Control Method	Touch
Control Type	Button Control
Controller Type	Hand Control
Customer Reviews	4.5 4.5 out of 5 stars (4,468)
Display Type	Digital
Finish Types	Matte
Global Trade Identification Number	00786710518348
Included Components	White-Rodgers 1E78-140 Thermostat Wall Dig Heat Only
Item Dimensions D x W x H	30"D x 8"W x 6"H
Item Type Name	White-Rodgers 1E78-140 Thermostat Wall Dig Heat Only
Item Weight	1.6 ounces
Manufacturer	Copeland
Manufacturer Part Number	1E78-140
Manufacturer Warranty Description	5 year limited.
Model Name	1E78-140
Model Number	1E78-140
Mounting Type	Wall Mount
Number of Batteries	3 AAA batteries required. (included)
Power Source	Battery Powered
Product Style	70
Shape	Curved
Smart Home Compatibility	Not Smart Home Compatible
Specific Uses For Product	Heater
Temperature Control Type	manual
UPC	786710518348
Unit Count	1.0 Count
Voltage	24 Volts
Wattage	45

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