I was continuously trying to fan myself with the script I was holding, but it was not working. When I noticed that everyone present was doing the same I knew I had to do something. It was our second last rehearsal and we needed to concentrate without distractions. Adjusting the thermostat settings had also not helped so I figured that the problem must be the air conditioning system. Later on, I went to the director. She too had noticed the heat, and the change in air quality, and talked to the people in charge of the hall. In my view, they should have hired a maintenance person who either once worked in the cooling industry or knew what to do to help with indoor comfort compared to the one who was there and knew close to nothing. I later learned that he was filling in for someone who was out on sick leave. The director told me to call the manager who in turn gave me the responsibility to call the HVAC company. Since I had no idea what the problem was other than the HVAC unit was not working, I told the serviceman who I talked to that the place needed HVAC maintenance. I was afraid that the home services provider would schedule the ac repair the same day as our last rehearsal but luckily it was a day before which was perfect. I was there at the specified time but there was nobody. To their credit, the HVAC technician showed up ten minutes later. He worked on the air conditioner with such efficiency that I was impressed. The HVAC professional inspected the ductwork and said that it needed cleaning. With the air duct clean and a new ac filter in place, my unit was as good as new.