Replacing Telephone Cords - How Difficult Will This Be?

You use 4 wire telephone cable, but you reverse the end modular connections. They are NOT wired like standard telephone cable. The BEST way is to run thru the ductwork as the cable connections will be connected at the control boards on each AC. The rear AC cable goes to the Front unit and then the tstat wall cable goes to the front unit. Hopefully, the only bad cable is the one between the rear and front AC, whic will make it easier to run. Doug