Any Guesses on This Question.....

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My Fuzion Impact 303 is prewired for a second A/C unit (in the garage area of the T.H) and this evening I was looking at the electrical box up in the ceiling by where the new A/C will be going. I have a 120VAC circuit up there of course and I also have a 12VDC source, fed from the fuse/breaker panel and there is also a three or four wire cable that is for the thermostat connection. So my question is this....Where do you think/guess the other end of that thermostat wire is at? It's no where obvious and I'm guessing that it's stuffed into the wall somewhere...possibly in the area that the existing thermostat is located...but that's only a guess. Anyone want to offer up a guess or does anyone know?