I live in the Southwest where swamp coolers are used to cool homes. A swamp cooler uses the basic principle of evaporation along with simple technology and electrical power to create cold airflow. First, one motor pumps water into pads of a fibrous, absorbent substance similar to hay, called cellulose. Then another motor powers a fan that pushes air through the pad, which is always pregnant with fresh water. When the entering air is very hot and very dry, some of the water evaporates into it. Evaporation needs molecular energy, otherwise known as heat, which ends up reducing the temperature of the air and adding humidity. Finally, the cooler air is pushed through a duct into a central location in the building that is being cooled, such as a hallway or main room.
My home is a split-level with swamp cooler duct work running between the upper and lower levels; vents in floors and ceilings, respectively.
I am considering switching over to refrigerated air. A technician from a local plumber stated I would not have to insulate the duct work because it runs inside the home between floors (if in the attic I would have to insulate, re: condensation).
I am concerned that this approach, not insulating the duct work, could pose problems from condensation. I would appreciate any insights/advice offered.