Steve,
I found a calculator for A/C btu's on the net:
http://www.cooloff.org/sub_cool.html
Dependending on insulation, the size works out closer to 13,00 btu. Remember that you might want to add 10-20% since you are not going to keep it on all of the time.
Good Luck,
Jimmy
Steve,
The first thing that came to my mind was insulation. Since the garage is not living space, there might not be much insulation in the walls. If the garage door ever gets opened, you'll have an almost instant change to whatever the outside temp and humidity is. If you only run the A/C unit when you are using the shop, it will take some extra muscle to make the shop cool and dry in a reasonable amount of time. I'm not an HVAC guy, but I'd probably vote for more cooling power than would be called for with a normal room calculation.
Ray
Steve,
I found a calculator for A/C btu's on the net:
http://www.cooloff.org/sub_cool.html
Dependending on insulation, the size works out closer to 13,00 btu. Remember that you might want to add 10-20% since you are not going to keep it on all of the time.
Good Luck,
Jimmy
For very little $ you can purchase sheet of insulation at the BORG and fit it into your garage door. This will help with AC and noise. A very wise investment!
Doug