I have a serious issue with putting a unit designed to disperse heat (air conditioning condensor) on an insulatory prefabricated pan. It's common practice, done everyday, and i think it's a mistake.
Concrete pads have desirable thermal properties, look better, and put money into small contractors.
Prefabricated pans are cheap, easy, they insulate the hot bottom on the machine from the nice cool ground, and can warp if set unevenly.
@ three yrs old my machine wobbled, overheated, the compressor blown so badly that even after the proper steps to remove everything, it spewed about a gallon of foam on the side of my house.
Who's with me on an initiative to recall and discontinue the use of prefabricated pans?