Update: After my initial review, AAA Arizona Auto Repair contacted my father-in-law and looked at his AC again. Turns out the valve that's supposed to close off the heater when "cool" is selected wasn't closing all the way. This let cold air mix with warm air before exiting the vent. The shop stopped the warm air by shutting the valve. Apparently it was about another $75 of work that they gave him for free. I applaud the shop for their follow-up to make this right but I'm still rating it at three stars. When the initial work was done they only measured the air temp at the AC unit and not at the passenger vent. I'm not an AC repairman by any means but it seems like common sense to check the temp at the vent where the air blows on the passenger. Had this been done, the shop would've figured out the issue when the initial work was completed.