What's the best way to heat camper between uses

I leave a 4 foot electric baseboard heater on whenever not in use keeping the TC at 60 degrees. The electric heat dries things out. It's shore power and I hardly notice the electric bill. When camping, if cold out, the heat is on at 60 or more degrees. I like and can afford my comfort. On hot days or nights, the Fantastic Vent is on doing it's thing. Solar covers that usage. Result, rarely is there condensation except right on the bottom edges of the windows during the cold.