A/C Pros in Highlands Ranch area?

[Ramsker]

What he found is completely possible, I would just want to know exactly which wire in the bundle is doing it, but I’m pretty demanding if the people that work under me. And in a house it’s almost impossible to pull a new wire so a wireless is about the only option. THte contactor I’m referring to is on the condensing unit. It is kind of like a relay. It uses 24v on that one for the coil and pulls the contacts in to start the compressor and fan

He actually said that it's fairly common (or maybe even most common?) for a shorting issue to be outside, so that matches with some other stuff he mentioned. He took a look out there and it seemed to all check out.

I really appreciate all the help and feedback here from everyone. I'm not the world's most handy guy, but I try to DIY stuff where I can and to learn along with way with repairs and home improvement . . . so it helps to put some additional pieces together along the way.

Here's a question on pulling a new wire.
The basement is finished, but it has a wood floor and a crawlspace underneath. The thermostat is pretty much above/near a little utility room in the basement (access panel for sump pump and crawlspace and a water softener). The furnace is on the other side of the basement, but the crawlspace is good sized and runs all the way over there. Could new thermostat wiring be run down under that floor and across/up to the furnace? Or does it need to be in/across the ceiling?