Central a/c is all set up on my finished basement as a 2nd zone. In the upstairs hall closet, I can see a large round pipe running down from the attic to the basement. Ceiling ductwork and vents in the basement are all connected to it. There is a programmable thermostat in the basement as well. The only thing missing is the wiring running from the fan in the attic to this thermostat. There are only 2 wires connected to the thermostat, and they run from the boiler for heat. My question is how do I go about doing the wiring to get the system up and running in the basement? Thanks.