While you can hang it in front of the A/C to dry it will most likely dry too fast. That is not the preferred method if you are trying to give it that long slow dry. The A/C removes moisture from the room air. So if your room air is has a high rh% you may lower the humidity to an acceptable range and everything works good. If the room air is all ready has a low rh and the A/C removes more moisture than your harvest can dry too fast not giving enough time for things to break down and may have a harsh taste. So knowing what your drying conditions are is important in order to to give a more accurate answer.