The setup on mine is that the air handler is actually powered by the condenser unit. They did have to install new line sets but the cost was still competitive. The wiring for the air handler is included in the line set. What's surprising is these air handlers are running on 14 awg wire. I mean, that's what you run for a light circuit. Very low amps. When my three ton unit is full out it's pulling about 9 amps but that's including the air handler. I basically killed three breakers in the old panel because I no longer need power to the air handler and no heat strips.