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The front A/C(bedroom area) in the 3402 cools a much smaller area and will freeze us out. We put a fan on the floor directing airflow down into the rear of the 3402 which is a much larger area to cool. We have the set point a 74 degrees and have never hit that point in extremely hot weather and by extremely hot I mean outside temps of 100 and above with high humidity and the RV mostly in the direct sunlight.
The temps on the roof and sidewalls can be extremely high and that heat is transferred to the inside walls. Temps of 90 degrees are not uncommon on the inside walls of our pretty dark colored Big Sky.
We are however comfortable in the extremely high temps the humidity is wrung out and even at a inside temp of 80 degrees it is comfortable. We also added a full window graphic on our rear window(can see out but not in) and added an awning over our main slide. The replacement A/C vents that blow straight down made a big difference.
I do not see how the ductwork can be damaged at the factory installation we will take a close look at the factory tour this fall rally.
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