Putting a new system in a home that has not had central air and heat before will require the installation of insulation, refrigerant piping, electrical service, wiring, thermostat, condensate piping, flue piping, flue terminations, slabs, filters, driers, registers, grills, drain pans, and an evaporator coil. Above all, the most important component installed with a new system is the ductwork.
Ductwork is composed of two parts – supply and return. A supply duct is attached to the outflow of the new system, delivering air to each zone in a home. The amount of air reaching each zone is determined by the size of the supply ductwork. The return duct attaches to the inlet of the new system and draws air out of the spaces to be heated or cooled. The filter is attached to the return duct and should be placed as close to the furnace or air handler as possible. Ductwork can be either fiberglass or metal and must be properly sized in order to evenly distribute the proper amount of air to each room.