My Heil furnace model #NFCP4800B1 is only set up right now for heat but does have the capability to have air conditon. how do i know what is needed to make this happen. i have no manuals on furnace as it was in home when i purchased.please help

Hello, in order to have air conditioning you need a evaporator coil, a outdoor condensing unit , a line set that connects the two to each other. You will have to have a cooling load calculation done so you know what size air conditioner you need for your home, also you will need to bring power to the outside unit from the main electrical panel in your house. Let me know if you have any other questions.