Originally Posted by mrjhathaway
I have a forest river sierra 40 foot 5th wheel with 2 a/c units. I have read some of the comments. My question is when the a/c in the living room is running it forces air through al ducts (upstairs and downstairs). When the upstairs unit is running it forces air only into the upstairs ducts. This seems counter productive as the unit for the downstairs is forced to cool the entire 5th wheel. No wonder the downstairs is usually 5 or 6 degrees warmer. Any suggestions or comments?
Close the dump valve in the center of the air return. That will force the air into the vents. However, it will seem as though a great deal of that air is coming out the upstairs vents anyway. How many return vents do you have in the living area for the 15k unit? There should be more than 2. Some people say that fixes their issues and some say it does not. Mine is in the shop having the extra return vents installed now. I probably won't have a chance to see whether or not this fixes it this year as summer is pretty well done.