The wife and i have been staying out in our new 30.5 CKTS lately (parked next to garage)and noticed the bath room and bedroom could use a little more heat. Granted it's been very cold lately but I decided to add a 500 watt 120 volt a.c. baseboard heat in the two rooms. It certainly made the spaces a lot more comfortable, and along with the electric fireplace, the entire living bedroom bath space stayed nice and cozy after initially turning on the furnace with 20 degree temps outside.
The units are TPI with integral t-stats sold separately. they're not the highest quality made but do work well.
I tied the branch circuit into the panel with the 2nd a.c. unit. I could have installed a mini side by side breaker, but didn't think it was needed. I also put a toggle switch in the belly compartment for summer winter use.