Hello, I just set up a new HC400 in a room with 3 big windows. It needs to run in the econ mode, the default setting, It is very quiet in that mode, just a whisper, and you get a much longer bulb life, I think. Go to Home Depot or similar and do what I did, get some blackout paper window shades, just stick them up on the windows. You will need a flashlight afterwards. Its very inexpensive, about $9 a box. Projectors by design, need a darkened room for good contrast.