So I did the dumb thing and passed under something and tore up my rooftop a/c. I removed the old a/c unit and installed a split a/c unit. Man… talk about an upgrade! Anyway, winter is coming and it’s getting cooler. My question is what wires are used to control the furnace and how can I install a thermostat? didn’t think much when removing all the wiring and thermostat and tossed them.