Whatever the "brand name," I call 'em all ENCLOSED PATIOS. If a typical patio adds $2,500 to the value, I might add $5,000 for an enclosed patio. I do not consider them to be the same as the rest of the living area. Years ago when FHA had an appraisal department one of my reports was reviewed by an FHA Staff appraiser. The house had a covered patio that had been enclosed with removable glass panels and was accessed by means of a sliding glass door off the living room. I called it living area and valued it the same as conventional living area. I was lambasted by the reviewer and had points deducted. (in those days your status at FHA required that you did not receive more than X number of points per year)
There are still older houses, here, that do not have heat sources except for a very old radiant unit in the bathroom wall.... We're much more concerned with A/C source rather than heat, even for FHA.