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Not sure about older models, but our 2005 has a resistance heating coil in the air conditioner. I read about this as an option in the Airstream literature, then went to an RV parts store and bought the coil, thinking I would install it myself.
After removing the cover, I found that Airstream already put it in even though it shows as an option (that we didn't knowingly buy).
In any case, we used this in Denver, over the holidays last year; and while it won't make you break a sweat, it kept the interior at around 65 degrees while it was in the 20's outside. Note: It was running continuously, 24 hours a day, while we were there.
As an aside, I would guess that running a heat pump would have the same limitations (current-wise) as the air conditioner; and that you would need at least a 20 amp circuit to run it. The heating coil uses less current than the compressor, so the combined current using the heating coil and air conditioner blower motor are low enough that we ran this off of the 15 amp plug on the side of our relatives' house.
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