quotes;I only want it as a screened in porch. A screened in porch does have windows and doors.
It has SCREENS for windows/wall openings and SCREEN DOORS, (if necessary, not all SCREENED rooms are where you need to, or can, exit from them), for exit. You are being argumentative or do not recognize the difference between SCREENS and SOLID windows and doors. SOLID window and doors create a temperature differential between the indoors and outdoors, and insulation DOES minimize transfer between the two areas, and when necessary the MORE insulation the slower the heat transfer occurs.