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A large majority of homes today have an HVAC system containing a Furnace (Oil, The diagram below shows how a basic 4-wire thermostat is connected as Thermostat Wiring Diagrams - HVAC Control far differently than air conditioning systems so make sure you know the difference and correctly identify the type. Here are common uses for wire colors: Blue or Black – C – Common wire, may be unused by your existing thermostat. Red – R – 24VAC power from the furnace's transformer. Red – Rc – 24VAC (dedicated to heat call) Red – Rc – 24VAC (dedicated to cooling call) Green – G – Fan. White – W – Heat. Yellow – Y – Air conditioner. A basic two-wire thermostat can be compared to a simple single-pole switch that you will They usually operate at 24V ac power, and the source of this control power comes from a These additional terminals are not shown in this diagram.Use High Performance HVAC to install the new thermostat along with the manufacturer's instructions and you will save energy. Getting rid of an old mechanical There are a variety of thermostat wire types. The main difference setting each apart is the number of colored wires. HVAC systems with more functions need Learn the color codes of a typical heat pump thermostat Wiring in your house. Always OFF the mains before attempting to change your own thermostat. The main trouble is dealing with those different colored wires, knowing which one does what Orange – This wire connects to your heat pump (if you have one). Here's how to wire a thermostat using the color code and, FYI, each terminal's purpose. Attach the red wire to the R terminal (Call for heating and/or cooling). Attach the green wire to the G terminal (Fan). Attach the white wire to the W terminal (Heat). Attach the yellow wire to the Y terminal (AC).