Dometic has had numerous complaints about the noise level of the low profile AC units (Penguin II), both the Heat pump version and the non-heat pump (although the heat pump models appear to have more reported problems). Dometic does offer a "soft rubber grommet" installation kit, and they will install them for free if the AC unit is less than 2 years old. You might want to call them. The fan noise on these units will be somewhat loud no matter what -- since they are not ducted but attached directly to the roof shroud. But I've read several reports that installing the grommet kit reduced the noise to an acceptable level. You may be able to reduce the fan speed with a resistor or some other mod, but I can't speak to that.
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