There is hairdryer in the room, but not in the bathroom.
I believe so. There was in our room and in the rooms of our group. In most hotels we stayed in Ireland, the dryers are in a drawer in the bedroom section and at times difficult to use due to location and height issues.
There was one in the bedroom but not in the bathroom. It had a short lead so I would recommend that you bring a short extension lead with you.
Get an answer from Killarney Towers Hotel & Leisure Centre staff and past guests.