A few items to note about the air conditioner. First, the air conditioner changed with models built after mid-June 2009. The original version had controls mounted on the unit in the ceiling. Later models now have a wall-mounted thermostat which controls the A/C and the heater. The thermostat also allows you to control the fan - either always-on (as most RV A/Cs are), or automatic where it cycles on with the compressor.
Many people with the older model wanted to modify it so the fan stays on all the time, and member BillB figured it out. The instructions can be recreated here upon request.
Finally, many people have complained about the sound level coming from the A/C. I agree, its very loud. Some possible options have been discussed, including adding sound baffling inside (used by car stereo installers), opening up the ducts, or adding a motor controller so the fan can be turned down somewhat (which would void any warranty and might allow the compressor to freeze up). If you find a good solution to this problem, please post it.