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We have an older Montana, but I pulled all of the vent surrounds and wrapped them with radiant barrier. I pulled the Skylight in the shower and completely blocked it with the same stuff. Roof vents cause a lot of heat into the trailer as the attic is not sealed off when you pull the covers off you can feel the crazy heat coming out. Then I put the vent pillows with radiant barrier on one side in each of the three roof vents. This made a world of difference! I’ve also found that if we are loosing the battle during the hot part of the day, I stop pushing AC through the vents and direct dump into the main living area. The 15k unit in the bedroom is always direct dump and can take care of the front half just fine and doesn't need the main ac units help through the three ducts which allows for more cold air in the main living area.
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