My layout era is steam from 30s to early 50s. I picked up two building (HO) that have a few window A/Cs in them. I came to the US from England as a teen in '50. We certainly did not have A/C. I don't recall that many people did (movie theaters made a big deal out of the fact that they were A/C'd). How likely is it that downtown (small town) buildings in the early fifties would have had window A/Cs? I just don't remember. I can easily get them out if they don't belong. eagle37
Window A/Cs were available in most areas of the US in the late 50's, and probably in major metro areas in the late 40s or early 50s. So you are probably OK if you model into the mid-50s.
