How to know if a unit has heat pump

I am looking at a used unit, whose manufacturer has gone out of biz. The brochure mentions the heat pump as an option, but can't tell if this particular unit has one or not.

Salesman says it says, "RV Comfort" on the thermostat and thinks that it is. Is there any way to examine the unit to tell?

And would a heat pump unit be better in hot and humid climates?

Thx for your help in advance!