Never heard of this, but I’m guessing it’s the same as a “Florida room”.
bed room
An
Arizona room is a semi-outdoor recreational room found frequently in homes in
Arizona, based on similar concepts as the
Florida room. The room is often a
patio that has been covered and screened-in, creating an outdoor feeling while preventing excessive heat and keeping insects and animals out. The room generally borders the back yard of the house and is often accessed directly from the living room, kitchen or other common room of the home.
According to a website run by
Phoenix newspaper
The Arizona Republic, residents slept in their Arizona room during the summer months, before the advent of
air conditioning, because the flow of cool night air made them more comfortable than in an enclosed bedroom.
[1]
Arizona rooms are often decorated with
Southwestern decor and furniture, and reflect the casual, informal style characteristic of the Southwest.
.........but they are not as common now....we only have two on our 32 lot block...one is small and he uses it for outdoor storage and the one across the street is length of modualar home and they use it for winter potlucks, superbowl and tv watching.....and tons of storage space.....as of right now at 101, no one is using their Arizona room.