The best suggestion we got from a sales rep at a camper show was to buy an electric space heater to take the edge off & conserve the propane. We got a small cool-touch Holmes one from WalMart with a fan & that little thing will keep the interior comfortable in a 27' trailer without running full on all the time. We bring the temp up using the furnace and maintain temp using the electric space heater. We set the furnace at about 60 and the interior comes up to near 70 with the little heater. Not a bad deal!
Me, one great wife who navigates & researches places to go & food to eat, one little boy who can't get enough camping, one border collie who refuses to be left behind!
2004 Fx4 F250 King Ranch SVT CC, PSD, Prodigy, no mods.