Heat strip use
 

The heat strip is only for taking some of the chill out of the HiLo. Maybe good for about 40degrees. You are best using a small space heater or the furnace. Be sure to leave a vent cracked open.

Generator
 

Anything is possible with enough time and expen$e. Hi lo have come with this option. I imagine if you located one, took enough pictures and measurements you could duplicate it. Most applications of this limited space are a Onan 2800 generator. I have one in my class B Camper. They are problematic at best. Repairs are expen$ive and mine breaks down quite often even with meticulous maintenance and proper exercising. I always wished Honda would get into the RV Generator market. FYI... I have a Honda EU 2000,portable generator and it will run a 13500 roof A/C providing you are not too high in altitude to supply the surge for starting the compressor.