I would move my daycare operation to the basement as much as possible if our air would have gone out during a heat wave. Of course, that only works if you have a finished basement so I don't know if that is an option for you. Otherwise, I would have told the dcp what's up and let them decide what is best for them. Then I would sit in front of as many fans as I have in the house and try not to move.
I hope that the repairman is able to fix your air asap today!