"Iowa883" wrote in message
...
I would like to put a "window" a/c unit in my shop. What BTU would I need
to cool a 24X40X12 high shop ? I would like something that would actually
cool it down and shut off, not run constantly to try and keep up.
Thanks,
Iowa883

BTW : lets say cool it down to 75 degrees , I also have R19 insulation in
the walls and blow in 6"thick on the ceiling . If this would help out your
calculations.



To help you out a bit as the others have chickened out!
I have a 24x38x9 foot shop, insulated similar to yours. I bought a used
11,000 BTU window shaker, it was cheap, so I was not out much. It would not
keep up unless I let it run constantly. Opening the overhead door to run a
vehicle in would cause it to lose ground and not catch up. It did a
wonderful job of humidity removal, so even if the temps rose close to 80F it
was still more comfortable in the shop than without the AC.

I have since replaced the furnace and added central air to the shop. I went
with a 1-1/2 ton condensing unit and it does well. I can leave the doors
open, then close the shop up, and it will catch up and cool the shop down to
the set temp in a reasonable time.

Now factors as windows, doors, and quality of the doors will have a big
effect on BTU needed, so your results my differ from mine. Considering your
shop has about 50% more cubic feet than mine I would guess you will need at
least 2 ton to cool it. Two ton window units are unheard of so one unit will
not do it. Perhaps two of the larger window units, (10,000 - 11,000 BTU),
will make a dent in the BTU load. Anything less and I would not bother.
You better get out you credit card! Window units of this size are $500 -
$600, unless you can dig up a couple used units!
E-mail is good.
Greg