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Hey guys a couple heads-up or ideas for you on the vents...
Make sure you use the higher density or "tight" expanding foam, your results will be much better.
Use an insulation knife or similar so shape/cut the foam.
Remove the black plastic rings from the vents and cut the edges of the foam WAY down around the vent openings. That alone will help greatly with reducing restrictions. (Pics below.)
Here's a little something else I found out that made my decision on what second AC unit to buy. The rear roof vent, at least in my 27.7 Vegas, can be made to feed the vent system. In other words, if you put a second AC unit in, you can have it feed into the entire vent system easily. This, to me at least, is huge. That means I can put a heat pump Mach 8 in the back roof vent and duct it into the stock ducts. Not only will I be able to run both AC's through the ducts and out the ceiling panels, I'll be able to cool OR HEAT the entire coach from EITHER unit. That will be cool! (sorry.)
When both AC units are running, I'll basically have 640cfm airflow through the vent system, which I severely modified for better airflow. It should be like a frozen tornado! Yes! Exactly what I want.
The mods to the front 15k unit are done, it's gonna be whatever it's gonna be. I ended up adding 420cfm worth of electric fans to the condenser case and built a duct for the main fan so it's now a "ducted" fan. Those two mods HUGELY increased the airflow through the condenser core. I also sealed up all the air leaks in the evap side and optimized the squirrel cage fan and area. I finally insulated the whole evap box with multiple layers of foam/fiberglass and dynamat. In theory it should be much more efficient and tolerant of super high roof temps, but time will tell for sure how much difference it all makes. Obviously it was a lot of work and not something most anyone else would want to do. I simply wanted to get the most I could out of the 15k, and that's what I got by doing the mods I did. The final thing I did was to add an outlet vent to the ceiling panel. I might actually add an inlet one on the other side too. By using one of the black plastic vent rings I can make it feed air into the evap inlet and still retain the outlet vent at the front of the panel.
I'm most likely going to order a 13.5k Mach 8 plus heat pump to put in the back vent. Even if the front 15k works way better, I still want a ton of cooling power because it will mean the generator will have to run half as long to cool the unit back down after it sits in the sun all day. We rarely have hookups so for our use optimizing AC efficiency while on generator is the number 1 priority. That's also not the case for a lot of you.
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