Along with an electric blanket, I have used digital ceramic heaters. Set them and let them keep everything in my 40' tour master warm during the night. Not only are they quieter, because I don't pay for electricity, they are economical for me. I would caution anyone paying "park" electricity rates. It could be very expensive.
One thing I have noticed, some heaters (and blankets) don't work on the inverter. In fact, some heaters are damaged when run on the inverter.
So, unless you have a true sine wave inverter, test it out while under warranty. I feel it is the heater manufacterer's fault if their product is damaged by "rv power".
Hope this helps.
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