I don't know for sure, my guess is that it will start without any heat down to about 32 ambient. Seems like the best thing to do is just put the heater on about an hour or so before you crank it. It sure makes it easier on your batteries if the engine is warm. Maybe DD could tell you at what temp the engine heat is needed.
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Tuga & Karen Gaidry
1999 Newell 45 w/2 slides
Coach #512
2005 Pilot
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