If you order the 2nd AC with heat pump option in the Grand Canyon; can it be plumbed into the duct work?? Also can it be hooked up to a dual zone thermostat so that you have one thermostat housing with 2 zones? It seemsI remember some saying that when they get 2nd Ac it uses the regular vent shroud that protrudes from the ceiling. Just wondering if ordered from Factory if it can be plumbed into duct work. Thanks for the info