I am a little old lady of 80, living in a townhouse in Maryland. I like working on assorted projects in my garage, but cannot tolerate the summer heat, which these days often gets above 85 degrees. I just installed a 14,000 BTU Black & Decker portable air conditioner and it is working splendidly! Why? I was lucky enough to have the ideal enviroment for one. The townhouse garage has walls on three sides, an insulated ceiling to the room above, an insulated door, and a place to cut a hole for the vent. All other options were way too expensive, so I took a deep breath and proceeded with this cheaper method and am so glad I did. Environment is all.