Can you drill small holes or find access points and shoot expanding foam in them? It's a closed cell product and wouldn't hold moisture. I would think (sometimes dangerous) you can also upgrade the A/C to a 15K BTU unit.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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