I do not wish to add 'what ifs' to this thread, but you mentioned you hadn't considered adding a failsafe to the AC.
So you're saying you could put a failsafe on the AC where if it gets TOO hot the AC turns off like you would use a Tstat on a heater? So you set the Tstat to like 90 and if it ever hits that temp you assume that having the AC running is not helping but hurting?