We use a small heater, picked up at Loews, probably five years ago or so. A couple of considerations, go for one that is very quiet, especially if you plan to use it at night, also one with a decent thermostat. We have found in the Gemini, which is a rather small RV, that small heater is about all we need down to 20 degrees or so, at least thats as cold as we have been in. Placed between the front seats, reversed when we are camped, aimed toward the rear, it heats the entire RV.
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