The Heating, Ventilation & Air-Conditioning (HVAC) is installed by a crew of specialists over the course of single day. The furnace and air frame unit is installed in the attic of our two story home to take up less floor space than a garage, or in some cases, basement install.   The Air ducts and return air ducts are run throughout the house from this central location.   Small spaces that look like unused or “dead” space behind closets during the framing process are actually the channels that the ducting for the first floor will utilize.  In addition to the Furnace, the compressor for the Air Conditioning is pre-wired on the outside of the house and all of the tubing is run from the air attic to that location.    Though our attic was large, 12 feet from the floor to the ceiling, most of the space was taken up by the vast network of insulated pipes and junction boxes for our home.