Hi, I am a commercial, electrician who would like to know if any of the window hole type units are better than others. As I only do commercial jobs I never see these unless it is installed for a teeny office in one corner of a metal warehouse building. Do any of the big brands that I see (and provide power to) on commercial jobs make these things? Like Trane, Carrier, Lenox etc? I saw a 24,500 BTU unit made by LG at Home depot, nice price but is it a good unit? I finally built my dream 12' x 30' x 40' Butler Building shop in my back yard and am thinking about a/c for it. 102 degrees today.