You need to give all the information you can so someone can make better suggestions. What kind and size AC unit? What kind of thermostat? Manual or digital? If digital, does it seem to have power? Has the tstat been changed? Are you on shore power or generator? Did the unit work and quit, or never worked?
BTW turning a breaker off for an hour makes no difference. If it trips because of overload, a few minutes will work. Give us all the information you can.