Frost protection

Parked at home, i have our wagon connected to the mains, and the electric heating [truma] turned on at minimum setting. This is keeping the inside temperature 7 degrees higher than outside temperature and the humidity level low. My question is, is this a good idea, or would the gas heating be cheaper ? Or is there a better alternative ?
Your comments would be appreciated .
Chris

Hi Dijon,
There is a long thread on this subject running at the moment in the coachbuilt section.

Brian2

Hi Brian2

Thanks for pointing me in that direction. We seem to be following a similar line of thought. I'm just wondering if there is a better and or cheaper method of achieving the same result.

thanks again. Chris