Just be careful with the big rooftop units. The draw a lot of power and can be damaged if there is low voltage. A lot of them require 30amps to work reliably and you can burn them out if the voltage is poor.
This thread just reminded me that I have a window AC unit in my garage. It was used for one summer only...that summer was 1996. I wonder if that thing still works...
2011 CBBQA Rookie ToY - 6th Overall, 2012 American Royal Invitational - Huminie's Hogalicious BBQ