If you have power, strategically placed light bulb will add some heat. Used this for years when had my 28ft cruiser in the water in Jacksonville, FL. 1, higher watt bulb, offers plenty of offset heat. I used 2 in engine compartment down to low 20's. Never an issue. When in New Jersey, pulled boat and drained😜
Of course on an RV, depends on where it is and for how long before winterizing.
ADVICE: get the small electric air pump and fittings required to blow out the system AND buy the inexpensive kit for water pump to pull anti freeze and push it through the system. Winterizing is an ez process. Just follow ALL processes to avoid issues. Being in GA, I use our RV and re winterize 2 to 4 times a season. In winter, I never travel without 3 gallons of rv anti freeze. Never know when something might cause us to lv the rv for a period of time. Even when camping in central FL.
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