I just bought a repo house and there is no identification on the wires coming out of the wall for the thermostat. I have a red, green, white, and blue wire coming out of the wall. I need to know where to connect them. The thermostat has terminals G, RC, RH, Y, and W. Which wires go where?

same place they were connected before

most of the time standard is red is your 24 volts white is W1 heat and green is for fan yellow is used for Y1 A/C

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This is the official installation guide for your thermostat. Go here:
http://customer.honeywell.com/techlit/pdf/PackedLit/69-2206EF.pdf

Wiring color to Thermostat Depending on what thermostat youhave and existing wires. Typically red and white are for heat and yellow andgreen are for cooling. On base of thermostat there should be initials stampedto identify wires by color. R. W. Y. G. Possible Rc. and Rh if so for most usesyou need to jumper these two together. You may have a blue wire instead ofyellow or green. If so just hook blue to y or g. Hope this helps you. Thanks.

On most applications for heating the red and white wires are used,however I would check what wires are connected to terminals on old thermostat. These connectons should be labled with initial of wire color,such as R,W,G,Y or Rc. If your green wire is hooked to R or whatever just hook new thermostat up like the old one and you should be ok. Hope this helps. Thanks.

make sure power is off before working on the fan wiring ..(trip circuit breaker)

here is what the house wires are
1. black is hot (power) all the time .. its normally connected to the black wire of the fans speed control switch .. that is normally operated by a pull chain ..

2. red is the same power as black except it comes from a wall switch .. this would be connected to the blue wire in the fan (that goes to its light) .. that will allow you to turn the light on an off from the wall switch ..

3. white is neutral .. it connects to both white wires inside the fan .. one goes to the fan the other goes to the light. .. if there is more than one light bulb then there will be more white wires .. hook them all together and to the white house wiring ..

4 then there is safety ground .. usually green or bare copper ... that is connnected to either a green wire inside the fan or bolted to the metal of the fan (often a green bolt is provided) .. the green wire is not required for the fan to run but is required as a safety to make sure no one gets shocked on the fans metal parts ..

after you wire the fan ..then turn on the wall switch .. if the light doesnt light then pull its pull chain until it does .. you can then tie up or remove that chain to prevent anyone from changing that position since you can now control the light from the wall switch you dont need that chain anymore .. the fan should come on slow med and high then off .. each time you pull its chain ..

the wires coming out of the wall are they all coated or is one bare, what size (gage) are they if there isn't 4 wires coming out the wall and there becomes problem that needs repair and the tech sees it the warranty may be void read the installation instructions they should answer your questions.

The Red and White wires coming from the furnace are the only ones that call for heat. the Green wire turns on the fan continuously, the yellow is for AC. If you have another wire color, it may be a Common wire and should not be used if your t-Stat has batteries. If no batteries, it goes to the C screw.

those wires dont go to the down draft. those colors are to hook up the stove. do you have the instalation instructions?

Jumper RH to RC and Y to W (Just like the old thermostat) and hook the cable wires as you have indicated with the exception of the blue wire - clip it back - it is not needed. This is a heat pump system so heating and cooling are done by the same unit. RH stands for Red Heat, RC for Red Cool, the W and Y are the neutral sides to the heat and cool control circuit. That should get you going good enough to start learning the intricacies of programming the box.