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Update...
Here's the delta information several people have asked for in this thread... 30 DEGREES. Not the 15-20 degrees that it was doing before and that Coleman says is acceptable.
So far, no matter what the inlet temps, my "highly modified" (lol) 15k is dropping the inlet temp 30 degrees. It's F'ing cold! And it puts out what feels like twice the volume of airflow too. It's a freakin tornado. The first day I started running it, I actually thought it broke because it shut off! I looked at the thermostat and it shut off because it actually got the inside temps down below my set temp of 72 degrees even though it was about 90 outside. It actually cycles like an AC or heater should, imagine that! The funny part was that the door was wide open the whole day because I was working on other stuff inside and out.
So now that I've had some hot days to test out my modifications to help make the Coleman 15k work better, I'd say it was an absolute success. The difference in efficiency when it was totally stock to now isn't trivial, it's pretty obvious.
All that being said, I still bought and just installed a second AC unit. haha. My wife and I love AC! I bought a Coleman Mach 8 13.5k Heat Pump unit. I wanted to see how the totally different design compared to the decades old design of the 15k. SO FAR, (literally just put it on and wired it up.) it seems to be performing way better than the stock 15k did. I'll know more in time and report back with the comparison between the two units. I also mounted it backwards to take advantage of the 65mph wind when driving, the condenser will get significantly better airflow when moving. If the amp draw ends up being low enough, I may be able to run the back AC off my inverter when driving. That would be cool.
Oh and the heat pump part should be useful. I just turned it on for awhile and it was blowing a TON of air at about 110 degrees. That should take the chill off the entire coach quickly.
Mach 8---
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