Definitely use furnace rather than space heaters. The added benefit of using the furnace is that the heat ducts for the furnace are usually routed through the RV in the same places as the water lines. The space heater would warm the air in the RV living areas; however, the areas where the water lines are run would not benefit from that warm air.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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