The cause of the noises is the fan. I don't think there is anything you can do to make them quieter. If we have shore power, we use a small ceramic heater. If not, it's a guaranteed "dog on the bed" night because the noise frightens him.
With the A/C, the best you can do is set the fan to "always on". It's the sound of it going on and off that is most disturbing. I suspect that most of the RVs use the same heater and A/C and that the noise is not peculiar to the r-pod.
2010 r-pod 171
2011 Silverado 1500
Nights camped 2013: 94