If your system doesnt have a c wire youll need to run a new cable from your furnace to your thermostat to install most of the modern smart thermostat models. Thermostat wire is just a big spool of bundled color coded wires.
When it comes to low voltage systems a 2 wire thermostat is usually known as a heat only thermostat and is used for systems like a gas furnace with only heating option.
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Thermostat wiring for furnace. The thermostat wiring on these systems can have very similar wiring properties. We have other articles here that will help you with thermostat wiring. The 18 refers to the gauge and the 5 refers to how many individual wires are inside the cable.
In this article we will provide specific information for wiring a heat pump for control. Strip the casing inches from both ends of both wires. To wire a thermostat you must first be aware of the type of system that you have in your home.
A large majority of homes today have an hvac system containing a furnace oil gas or electric and an ac unit. Wiring a heat pump is different than wiring an air conditioner with a gas furnace or boiler. Install the white wire on the thermostat and the furnace terminals that say w connect the red wire to the thermostat and the furnace at the terminals that are marked r.
Strip the red and white wires back about 14 inch at both the thermostat and the furnace ends. The 2 wire thermostat for line voltage systems are technically known as single pole thermostat and the 4 wire version is known as double pole thermostat. These other articles help you with thermostat wiring colors and thermostat wiring diagrams.
Most thermostat systems have two wires. One is red the other is white. Connect the white wire to the w terminal on the furnace and thermostat.
Most two wire thermostats wire have a red and white wire encased in a brown insulated coating.
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