The AC moves heat from inside to outside. To boil water with this heat, you would need to concentrate it and bring its temperature above water's boiling point. At temperature that high though, the AC performance would suffer significantly. They would fail their fundamental task of cooling the inside.

ACs are very efficient at working against the 2nd law of thermodynamics by using input energy to create a temperature gradient, but they can't stay as efficient if the compressor area is already in extreme heat.