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In most cases, the terminal is called Y1, but Y2 is the name for some air-conditioning systems with complex 2-stage compressors. Yellow is the most common color for this type of wire. Depending on the structure, it can be connected to W or W1. In old thermostats, the letter combination is RC. In new thermostats, this Wire is designated by the letter R. It is a power wire that connects the R terminal for 24V power. Red Wire is a part of every type of thermostat.Wire 3 is used in 3-wire thermostats and all consecutive thermostats wire 4 is used in 4-wire thermostats and all consecutive thermostats, and so on. Wires 1 and 2 are used in all thermostats. Here is the color-coding system for 24V thermostats. 8 Wire Thermostat is used in some complex heat pumps.7 Wire Thermostat is also a part of some air-conditioning systems 2-stage heating systems, as well as control alarm systems.6 Wire Thermostats are used in some air-conditioning systems and most complex 2-stage heating systems, as well as heat pumps with complicated heating and cooling systems.It is used in newer smart thermostats that require a C-wire to function. 5 Wire Thermostat is the most common thermostat for most HVAC systems responsible for all kinds of things, including furnaces, heat pumps, and air conditioners of a new generation.It is a common form of a contemporary smart thermostat like the ones by the Nest brand. 4 Wire Thermostat is used in HVAC systems and heat pumps.3 Wire Thermostat is for boilers and water heaters.A 5-wire structure is the most common one found in thermostats like a standard Honeywell thermostat found in most American homes. How many wires are there in a thermostat? What are different thermostats used for?Īn electronic thermostat may have a different number of wires, anywhere between 2 and 8. Usually, thermostat wires are plenum-rated unless they don't have to run through air-circulation spaces in buildings. What is a thermostat wire?Ī thermostat wire is a low-voltage solid copper wire used for different purposes within a thermostat and in the systems connected to the thermostat. There are various types of thermostats, but electronic ones are by far the most popular, followed by programmable electronic thermostats.

Prices for common circular thermostats vary between $90 and $250. The most popular brands of thermostats in the North American market are Lowe’s, EcoBee, Nest, Honeywell, and Emerson. Thermostats are used in individual heating, central heating, water heating, heat pumps, HVAC systems, and other equipment. Thermostat is a control device that regulates the temperature in a building or designated space. This blog provides an easy-to-understand summary of all things thermostat wiring. Thermostat wiring is a tricky topic due to complex color-coding of wires that go into the thermostat.