In central air conditioning, the inside heat exchanger is typi.y placed inside the central furnace AC unit of the forced air heating system which is then used in the summer to distribute chilled air throughout a residence or commercial building..Packaged systems give you everything you need, all in one. Experience high performance comfort all year long, with the reliability and efficiency that only Trane can deliver. All with the flexibility to accommodate rooftop or ground placement. Packaged HVAC units maximize the efficiency of two machines in one sleek unit..A packaged HVAC unit can also operate in a variety of settings including ground level outside or on the roof. For more information on packaged heating and cooling systems, contact a local American Standard Heating Air Conditioning Customer Care Dealer. They will be able to answer any questions you have including which configurations and functions you’ll need to help your family breathe a li.e easier..A chilled water air conditioning unit uses liquid water, rather than condensed refrigerant, as a cooling medium. A chiller unit outside the building cools the water, then the unit pumps the water to heat exchangers inside the building..