We wanted a unit in the BR to cool on hot summers at the beach. Since the Heat Pump is ducted throughout the unit, putting in an A/C unit in the BR was all we needed it's 13,500 BTU vs. the 15,000 BTU on the HP. The dealer suggested installing the heat strip for colder weather as a supplemental heat source since we were already putting the A/C unit in the BR. So, it was an inexpensive addition, and when hooked up to shore power at a park, it eliminates consuming propane. I agree with Delaine & Lindy that a small ceramic heater would work just as well; however, given the lack of floor & counter space in the BR, I like the out-of-the-way location provided by the ceiling A/C unit.
Also, if you're installing the BR A/C unit, I would highly recommend a thermostat control unit. I had one installed on the radius wall of our Landmark after first trip with the BR unit installed. The controls would shut off the cooling, but left the fan running constantly - I couldn't sleep well with it on full-time.
Good luck!
Victor