I need to upgrade the heating and cooling in an 1100 sq ft. bi-level condo. The unit is on the 4th floor of a 20 unit building. There are currently two thru-wall heating/cooling units on the first floor of the condo. The upstairs has a small thru-wall cooling unit and three baseboards. There are two 220 outlets on the first floor on the outside wall. What options do I have? Can I add exposed ducts? Any local HVAC guys on the board? I am in Jersey City, NJ.