National RV offers basement a/c as standard in their Dolphin LX series (high end gas model).
I haven't owned a basement a/c model myself, but would like to add a couple comments about RV a/c in general. One is that the ducting is lousy in many RVs, generating a lot of air noise. Most of the noise you hear with roof a/c is air rushing through the ducts. Our roof a/c is quiet when the auto-fans are running on low, but it gets pretty noisy when they crank up to higher speeds. I hear very little mechanical noise from the a/c itself, either inside the rig or outside. I don't know if basement a/c in general will have better quality ducting, but I encourage you to listen closely in ANY rig yu look at. And try all fan speeds, not just low.
Second, you never have enough storage space if you live in the RV more than on weekends or a few weeks at a time. Basement air definitely consumes the equivalnet of one storage bay, whereas roof units do not take any usable space.
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Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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