I detest roof air and Onan generators. I use a Honda 2000 and an 8000 btu window ac. I went out and checked around 45 db on low. The db measurement does not measure tone some sounds are much worse than others. Think scratching nails on a chalkboard. I have 3 minis in my house and if I had room for the evaporator in my little Toyota would have put one in there a long time ago!
They duct the cooling air in some RV's, ok good. Then leave a hole in the roof to where the fan and blower motor are, well duh!! Might as well sit the unit on the kitchen table! Very simple fix, duct the return air with baffles.
I am sure some are reading this thinking well whats the big deal? Some are more sensitive to noise than others is the big deal.
I have a AtWood AirCommand and it is easily 50% quieter than the Dometic it replaced. It is much colder, throws air much further and also uses less power.
1992 D250 Cummins 5psd 2005 Forest River T26 Toy Hauler
I built my own silencers and ran them for several years. These have nice filters and look even better than mine. Pricey but sure are well thought out and built.
H/R Endeavor 2008 Ford F150 toad >Full Timers Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
I had a Dometic in our old rig. It was so loud I couldn't watch TV without the volume being all the way up. We have two Coleman Mach units in our current rig and they are much much quieter. Whisper quiet is the way to go but the Coleman's aren't bad at all.