my old unit has fan heat auto on/off with just wires will this work? also my old does have mercury does this?

Your question is not clear. If you are asking "does this have a fan switch that has two positions (on and auto), then the answer is yes. If you are asking"does this thermostat switch from heat mode to AC mode automatically (very common in southern California), then the answer is no (You must switch from Heat to AC manually). It doesn't contain mercury.

I need a 6 wire thermostat. Is this? It's for my mother. She gets confused with the preprogrammed, digital ones. Can you help me?

They claim this thermostat will handle all systems. My 93 year old mother lives in an assisted living facility. They use this thermostat, the building has central heating and central air conditioning. I ma not sure about a 6 wire system. I would call the manufacturer and ask him. It is worth the hassle because it is very easy to use.

can it be used at 120V? thank you.

No. It's can only be used on 24vdc power supply.

does white rogers thermostat use any batteries

The White-Rogers 1F56N-444 thermostat does not use batteries.

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Emerson 1F56N-444 Mechanical Heating and Cooling Thermostat

Emerson 1F56N-444 Mechanical Heating and Cooling Thermostat

Product ID: 298518256

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Details

Brand
White-Rodgers
Controller Type
Push Button
Temperature Control Type
Manual
Connectivity Technology
Wi-Fi
Power Source
Corded
Item Weight
127 g

📏3-Wire Mounting

🔌24V Power

🌡️Bimetal Thermometer

Description

🌟 Elevate Your Comfort Game!

SLEEK MODERN DESIGN - Fits seamlessly into any contemporary home decor.
PRECISION PERFORMANCE - Enclosed contacts ensure reliable temperature accuracy.
USER FRIENDLY CONTROL - Mechanical knob for straightforward temperature adjustments.
LIGHTWEIGHT EFFICIENT - Weighs only 127g for easy installation and handling.
UNIVERSAL COMPATIBILITY - Easily integrates with various heating and cooling systems.

The Emerson 1F56N-444 Mechanical Heating and Cooling Thermostat is a universal solution designed for optimal temperature control in your home. Featuring a built-in bimetal thermometer and a 3-wire zone mounting plate, this thermostat ensures reliability and accuracy. With its modern design and lightweight construction, it’s the perfect addition to any heating and cooling system.

Specifications

Brand	White-Rodgers
Controller Type	Mechanical knob
Colour	As shown in the image
Included Components	1
Item Weight	127 g
Voltage	24 Volts
Material	As shown in the image
Shape	Rectangular
Style	Modern
Backlight	No
UPC	786710532030 786710532627 696498759270 094705163504 671256977189
Global Trade Identification Number	00786710532030, 00786710532627
Manufacturer	Emerson Thermostats
Country of Origin	USA
Item model number	1F56N-444
ASIN	B006FNREO6

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