Our MH stays plugged in in the driveway all the time we aren't traveling in it. A/C is running, fridge turned on, etc. We even set the front heat pump to automatically heat if needed (we're in Florida). Actually seems to keep everything inside a lot nicer, no smells, etc. I have heard of folks putting space heaters inside the unit and that can lead to some issues as they can put a pretty good load on an electrical system and are always a fire hazard.
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!