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WHAT DOES RH,RC,W ,Y,G MEAN - Heating & Cooling

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R is red, W is white, Y is yellow, and G is green. At the same time, RC is power for cooling, RH is power for heating, a jumper is often placed between the two if the A/C unit uses the same power for both cooling and heating, no jumper if cooling has its own power supply and heating has its own power supply.
W is for heating, warming. This is the signal to the a/c unit to turn heating on.
Y is for cooling, this is the signal to the a/c unit to turn cooling on.
G is the indoor fan, airflow. This is the signal to the a/c unit to turn the on the indoor fan on.
Y, W, and G gets power to signal the a/c from Rc and Rh, as switched by the thermostat. Jumper R to Y and the cooling compressor turns on. Jumper R to G and the fan turns on, etc.

Posted on Apr 07, 2015

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These are the identifiers for thermostat wiring terminals / wires.

Wire Thermostat

Posted on Apr 07, 2015

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I have 4 wires green blue red and white my red is connected to the rh rc with jumper green connect to g blue to y1 and white is connected to w1 my new thermostat has no rc rh or a jumper


Paulette, if your new thermostat has no Rc and Rh thats fine. The Red wire should simply go to the R terminal. The Rc and Rh terminals on the old one was for the old 'two transformer' systems. The vast majority of systems now have no need for the Rc Rh terminal and jumper. The rest of your wires connect as on the old stat also.

Jul 31, 2015 | Heating & Cooling

1 Answer

I am wiring a Honeywell wifi unit and I used a separate 24v transformer and connected to the c and rc terminal. My system is ac and heat and uses both and rc and rh wire. I wired the rc to the r ter


A thermostat is a switch. It connects 24vac from one terminal to another depending on the request. The 24vac comes from a transformer, usually located in the furnace and connects to the R terminal. Since you are using RH and RC without a jumper between it means there are two transformers, one in the furnace for heating (RH) and one in the air conditioner condenser used for cooling (RC).
Your old thermostat was probably mechanical and did not have a C (24vac common) terminal. Your new thermostat requires power to operate therefore needs a wire connected to a C terminal. I would get rid of the transformer you added and look for an unused wire in the bunch at the thermostat. If it's there connect it to C on the thermostat and to C on the furnace. Remove any jumper from R to RC or from RH to RC depending on your thermostat and connect wires same as the old thermostat.

Jul 04, 2014 | Heating & Cooling

1 Answer

HOW CAN I TELL WHICH RED WIRE IS RC AND WHICH IS RH? THE WIRES COMING FROM MY WALL ARE NOT LABELED AND ARE THE COLORS 2 WHITES 2 REDS AND 1BLUE


This is a fairly hard question to answer. Evidently someone has run two sets of wires to your thermostat. One set has three wires in it: red, blue and white. The other set has two wires in it: red and white. One or maybe both red wires is the rc and rh wire. RC and RH actually wire together with a jumper wire. The RC and RH wire is usually the red wire that goes to the "R" on you furnace circuit board. If you can find out which red wire goes to "R" on your furnace circuit board you will solve the problem.

May 10, 2011 | Heating & Cooling

1 Answer

Need help wiring a thermostat with 5 wires don't know what rh and rc mean.and how they connect. thanks


Hi, on a thermostat like you have, the RC and Rh have a jumper wire that connect the two using the red -hot wire coming in. This means R-cooling and R-Heating. So, take the red and connect to either one, and make sure you use a jumper wire to connect rc and rh together along with the red wire coming in. Yellow will go to Y for cooling, W for heating, and G,green for the fan. If you have a blue wire left over, it is a spare, unless you have no yellow. If it doesn't have a yellow, use the blue wire for cooling. Some contractors will use blue instead of yellow. If not, the blue is a spare wire.
Shastalaker7
A/C, Heating Contractor

Apr 10, 2011 | Honeywell Heating & Cooling

1 Answer

I purchased a rth2310b and connected the red wire to the RC and white to w the green to g. It still will not start furnace. This is a gas forced air.


I think there is connection labeled Rh. The reason for having Rc and Rh is that some units have a transformer for the heating unit and seperate on for the cooling unit. If you only have 1 transformer then they have a jumper between Rc & Rh. Rh being for heating and Rc for cooling. Hope this helps. Let me know what you find.

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1 Answer

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RH and RC are basicly the same and used in 2 tramsformer system. it sounds like you only have one in that case you out a jumper between RH abd RC

Aug 30, 2009 | Heating & Cooling

1 Answer

Replacing Old York TS to HoneyWell RTH230B


rh is hot for heating rc is hot for cooling looks to me like ya need a heat pump stat some thing to control the reversing valve.Tom

Jun 18, 2009 | Honeywell Electronic Programmable...

1 Answer

Replacing a Williamson (White Rogers) Termostat


rh is power for cooling terminal and rh is power for heating terminal connect red wire to rc or rh and there should be a jumper between rc and rh if not install one all other wires are color coded correctly. now the blue wire is not used.

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I have a manual thermostat with the following wire connections (Y, G, R, O, C, & E) with the respective wires attached (yellow, green, red, orange, blue, white). My 44260 has available G, Rc, Rh, Y/O, W/B, Y1. Which wires should I connect to which terminals on the 44160. Thanks.

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