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I do have to say that I was skeptical about putting a vent on the ceiling AC cover would do anything, so I tried an informal experiment. The AC could not cool our Axis down on our last trip after a day on the road with only the cab AC working. So, I've been trying to fix that issue ever since I got home.
Last week, I did a test to see if my improvements up to that point would make any difference. In the middle of that test, I had the cover off while running the AC and noticed a considerable amount of air coming directly out of AC. I mean, blowing dust bunnies and paper around on the floor kind of air movement.
So, I just got back from running the AC without the cover to see if it cooled down the coach any faster.
So, both tests were started when the coach thermostat said it was 80 in the coach. With the cover on, after 35-40 minutes, the coach had cooled down to about 75. With the cover off, after the same 35-40 minutes, the coach had cooled down to 71.
I'd say that having the extra air flow made a huge difference.
A couple of caveats:
* When I ran the test with the cover on, it was about 86 outside air temperature. Today, for the cover off test, it was only 80. Other than the air temperature, everything else was the same (same time of day, same amount of shade, etc.)
* When I ran the cover off test, I wasn't using a fan to circulate the air in the coach. I relied on the AC to do that. It might have been even faster cool down if I had a small fan to circulate the air between the main part of the coach and the bedroom with the thermostat.
I'm going to order one of the vents and install it in the cover. The real test will be when we get back to Kansas or Colorado on the trip back out to Utah in August. It seems impossible to find shade in Kansas or Colorado where we need to stop for the day!
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