Seems to me that the DIY coolbot idea is a perfect clone, except for the icing condition. This should be able to be avoided if the 'crash' cooling is at a minimal rate. This rate I do not know. If maintaining, say, 42degF, the coils should not ice. If, however, the chamber was set to reach 42degF from, say 66degF, a 'slow enough' crash cooling rate should suffice. Any ideas/experience on what rate will not ice up a standard/cheapo window ac unit?