"I am going to ask a similar question. My shop is about 40 feet long and 12 to 16 feet wide with 12 foot ceilings. The most often used tools are in the center. I have a window that looks out onto a covered car port. I would like to put a 14000 btu window unit in the window. I already have the 220 there. But, it would be blowing the hot air out onto the covered car port and about 3 feet from the AC would be the side of my van. The other 3 sides of the car port are open.
What do you think? Is this AC big enough?
That depends how cool is cool enough for you. The basic residential rule of thumb is 400 sq/ft per ton of cooling (12,000btu), based on an 8' ceiling.
That would put you shop load at about 15,000btu IF it had an 8' ceiling, With 12' ceiling figure approx 50% more or 24,000btu, the equivalent of 2 tons. Of course a working shop generates much more heat than a residential environment does so that increases the capacity needed also.
So, is the 14,000btu unit properly sized? No. Will it give you any relief? Yes, it will do some cooling and some dehumidifying, it just depends how much is enough for you...
T