There was a thread almost identical to this one on another site yesterday, but in that scenario it was a 240 volt, 20 amp pool pump receptacle with a 120 volt duplex convenience rec jumped off that same circuit. It was resolved that if it didn't violate 210.23(A)(2), then it's okay. Very darned seldom will you run into a 20 amp condensing unit. Many evaporative coolers are 20 amp, but they're used in a limited geographic area. My personal preference is to wire all the house's outside receptacles on one circuit expressly for outdoor recs, and I catch the rec in the combo HVAC disco with the outdoor rec circuit.
"Nothing is foolproof to a sufficiently talented fool"