I had my dash air fixed also, it seems to be working, but it does not blow as cold as it should.
However, that does not matter. We now run both house airs and use a fan to blow air into the "greenhouse". This works very well.
We gave it a good test this past weekend. While traveling home, at the peak of the heat in the afternoon (93* and 70% humidity) and facing into the sun, we remained comfortable. This takes the load off the engine and allows it to run cooler.
When we ran the dash air under those conditions, the engine fan would kick in often. Without the dash air running, the engine fan rarely runs.
Mileage is something that I've been experimenting with. The below results always includes towing a Wrangler. Plus the air temp has always been in the 89 to 93 degree range, with the humidity usually at about 65 to 70%. lastly I cruise at about an indicated 62 mph.
When I run the dash air alone, my mileage has been in the 6.4 to 6.7 mpg range.
Dash air plus house air running, on a windy day, 5.5 mpg!
Decided to not repeat that test, so with only one try the mpg result is probably lower than it might be if averaged over several trips.
Running both house airs, and no dash air, I got 7.05 mpg this past weekend. I will run this way on my way to Colorado in August to see how this number holds up.
The best mpg I've ever achieved was 7.3 mpg with no air running.
At this point I believe that during the hot months in Florida, the dash air compressor runs constantly and puts a serious drain on the engine resulting in poorer fuel mileage, than when running the generator and house airs. The testing will continue.
Terry & Linda; plus LeMeiux & Hurakan the Burmese cats
'03 Kountry Star 3740 W22, US Gear Unified tow brake, Blue Ox Aventa II tow bar, '02 Jeep Wrangler