Does furnace and AC work together?

Air conditioning systems work hand in hand with your heating system, so upgrades to your cooling system will be affected by the efficiency of your heating system. Furnace heats the air in the winter and the blower circulates air through the home. AC evaporator coil removes heat and humidity in summer.

What the terminals on the furnace terminal board mean?





These strips of terminals have markings on them to signify the heating connection, the cooling connection, the fan connection, and heat pump connection, as applicable. There is also a terminal that supplies the power to run each of these functions.

How do you wire a furnace with AC?

Quote from the video:
Quote from Youtube video: That's for cooling G is for fan or C is 24 volt power for cooling or is 24 volt power for heating and C is the common. So the color code we usually use W. That's white why.

Where do AC wires go on furnace?

The white wire underneath your thermostat connects to your heating system. It terminates at your air handler or furnace. The white wire connects to terminal W in industry-standard thermostats.

What are the four wires in a thermostat?

In general, the heating wire (often white), goes into the “W” port, the cooling wire (often yellow), goes into the “Y” port, the wire that sends power from the HVAC system to the thermostat (often red), goes into the “R” port, the fan wire (often green), goes into the “G” port, and the common wire (often blue), which …

What color is the OB wire on a thermostat?





It’s usually blue, but it may also be black, brown or purple. The O or orange wire connects to your heat pump (if applicable).

How do I wire my furnace to heat only?

Quote from the video:
Quote from Youtube video: Our red wire on the r terminal. And the r and the rc they're both r's so they're linked together with the little brass tab here.

How do you hook up a central air unit?

Quote from the video:
Quote from Youtube video: If you're feel you're capable we'll show you how in this video. From the outside of the condensing unit where it hooks up into the home right up near the main electrical circuit panel in your house.

How do I wire my central air?

Quote from the video:
Quote from Youtube video: So we're going to make sure we have a 15 amp breaker powering. This air conditioner and assuming that you have the correct one for that then you can move on to hooking up the wires.

What type of wire is used for AC units?



Importance of using correct wire size in AC



It is strongly recommended that you use a 10/2 or 10/3 wire for all air conditioners. This is the standard wire size used in the U.S. It is also the recommended size of wire for most refrigerators, washing machines, and dryers.

How does a 4 wire thermostat work?

The concept is that when you adjust your thermostat its like flipping a switch, and you are providing power to the your HVAC system to work, it’s just that in a typical 4 wire thermostat the thermostat decides where to route the power to turn on your HVAC system to make it heat, cool or run the fan.

What are the wire color codes?

3-Phase Wire Color Codes

  • Phase 1 – Black wire.
  • Phase 2 – Red wire.
  • Phase 3 – Blue wire.
  • Neutral – White wire.
  • Ground – Green, Green with a Yellow Stripe, or Bare Wire.



What does green electrical wire mean?

grounding/earthing wires

Green: The green wires are the grounding/earthing wires in the circuit. The green wire can be connected to another green wire only. The grounding wire is not meant for lights or fans and is used mainly for socket purposes such as in the case of AC’s, geysers and other heavy load appliances.

What colour wire goes to L and N Australia?

International Wiring Colour Codes

Region Earth (E) Neutral (N)
Europe & UK Green Blue
UK (Old) Green Black
Australia Green Black
USA Green White



What color is the power wire in a house?

The color code for AC power wiring is similar to the code used in the United States: Phase 1 – Red. Phase 2 – Black. Phase 3 – Blue.

Can I connect the green wire to the white wire?

You cannot connect the green wire to the white wire. The green wire is the grounding wire. It provides a path that electricity can follow to the earth. If a malfunction occurs, the grounding wire will defend against electrical shocks.

What is standard electrical wire?

Wire Gauge



The most common sizes you’ll find in residential work are 14-gauge and 12-gauge. Larger appliances such as electric stoves, electric water heaters, electric dryers and central air units will often use 10-, 8- or even 6-gauge wire.