I have the similar experience after installing AC in living room recently. Previously I used to listen music with windows open and fan off as the fan noise is high. But for movie watching for few hours I am forced to switch on fan. At high speed the fan noise is too much. Now with A/C on and windows closed it is totally different experience. Once the room cools down the A/C fan noise is acceptable. AVR and Plasma doesn't get warm/hot. So I feel A/C will be good for the A/V long run.