My 1500 sq ft shop has a 8000 btu window unit in it to cool a small office room. 8x15ft. Anyways, Today for the heck of it I decided to see if it would cool the whole building and I swear after it was running for about 15 minutes the shop was a few degrees cooler! Lol I actually had a fan on to blow the cool air from the office room outside to the rest of the shop. Makes me wonder if I just got a bigger 240v unit if it would cool the shop. It was only 85 degrees outside today, so maybe that was the reason it seemed like it was working. I never messed with the window a.c. unit before since I thought it would only be big enough to cool that little room.