So here is the crazy thing....
About RV air conditioners - I hate them. Refuse to use one and did not want one (or 5 of them) on the bus.
The bus had AC that I have since canibalized to build a custom system. It obviously only ran when the bus ass engine was on. A carrier 05G compressor (now up for sale) and about 8 tons of cooling for the once 57 passengers.
I don't like the RV air units as they are power hungry and so loud! If you have one on over your head, watching TV or something was literally impossible. I set out to do something different. With all my research I wanted to go hydro and the chiller route. Chillers are used in luxury yachts and where more zones need separate control. It is more efficient to transport chilled water to your area of cooling than it is to duct air. This is why large building use them for heat/cool over individual handlers.
So I'm building a 7 ton chiller. Dual 2stage scroll ultra tech compressors with two independent closes refrigeration loops. These chill 30gal of glycol / water mix to be pumped to the 5 zones.
5.Back master office / bedroom
System has 4 stages of cooling. And uses two large brazed plate exchangers and 410a refrigerant. The original rooftop evaporators are still used but re-routed to two independent lines per compressor. Each compressor can offload to 70% and is controlled by 4 temp regulators that control the contractors / relays.
I'll post pics of the install.
Each air handler now will be small, quiet and independently controlled per zone. The fans are actually radiator fans that run at half speed and move lots of air. Barely audible.