there's currently one system that serves the entire house, there's a 135K furnace in the attic with a 5-ton condenser and coil. it is in a horizontal position, the existing duct system is 21 ft long but should be extended five more feet to cut down on some of the flex line runs at the end of the duct. it is currently three zones, first floor second floor and basement. The basement is connected but it's currently not being used, each branch line to every room has its own zone damper and they are then connected through relays to break out the first and second floors and the basement as well. we are going to perform a load calculation to determine the correct size system for the house, we are going to give an option to replace like-for-like with one new system. we are also going to give an option to change it to two separate systems. currently the furnace is a high efficiency furnace, if we do something along that line again we will need to cut a small supply from the furnace to make sure
