Managing 2 air conditioner airflow
Was out for a weekend trip with my buddy and decided to play around with the air conditioner vents. The rear a/c was running almost non-stop and it was only about 90 deg outside and cloudy. That bugged me. So we went investigating. For info, it's a 35' 5er rear living. Both a/c's are 15k Coleman Mach. When I bought the trailer, both thermostats were by the entry door. I moved the thermostat for the front a/c to the bedroom.
We figured out that both a/c units are ducted and they both have the vents on the a/c unit itself. What we did first was remove all the covers inside. Holy crap! There is a LOT of air flow and without any restriction, it blows straight down like a hurricane. So then we put cardboard over both inner covers so that all the airflow went into the ducts. That made the duct airflow much better, but the rear a/c was still working harder than the front one. What worked the best was to plug the front a/c so all airflow went into the ducts and left all the shrouds off the rear a/c so it did the hurricane thing. With that configuration, both a/c units ran about the same amount of time and they did not run nearly as long / often as the original configuration. I also really liked coming in from the heat and standing under the rear hurricane to cool off quickly. But no shrouds looks like crap, so I have to do something about that.
So, now I have a configuration that works, but not sure what to do with the rear a/c unit. I looked at the ABS inserts that cost their weight in gold, but that wouldn't really help me. The piece of cardboard up front does a great job of forcing everything into the ducts. So I don't see a need for that in the front a/c. I would like to have a way to set up the rear a/c so that it either goes 100% to the ducts or 100% straight down into the trailer (essentially a straight path through both shrouds, not going sideways into the dump vents on the outer shroud). Hope that makes sense.
Anyone ever done this?
2015 Chevy 2500HD 6.0 4x4 CC SB
2021 Salem Heritage Glen 290RL