A “Florida room” is a room with lots of sunshine. It can be a screened porch or a room with lots of windows. The term is used in several states, but the Dictionary of American Regional English found greatest usage in Florida itself.


(Dictionary of American Regional English)
Florida room n. chiefly FL
A room with large windows used as a living room or family room.
1953 Washington Post (DC) 16 Aug sec B 3/3 (Hench Coll.) [Advt:] Glass-walled Florida room with two magnificent floor to ceiling window-walls (entered from living room).

21 January 1952, Fort Pierce (FL) News-Tribune, pg. 7:
$14,750, 90 ft. plot, 5 rooms, spacious Florida room, utility room, car porte.

20 September 1980, Chicago Tribune, “They’re ‘astamagootis’ in Iowa” by Frederic G. Cassidy, pg. W10:
Florida room: a Florida term for a sun room or screened porch.