Given what I know about running at night (30 mph, not so great), and what I think I know about your
winter temps, not sure I'd trust much of what your seller said about winterizing... unless you'll be on the
boat 24/7 with other heat sources running.
The whole regime is extensive and with details specific to your
boat, and varies somewhat depending on whether you're storing in
water our out, but in very general and abbreviated terms:
- run potable (environmentally friendly)
antifreeze through your engines and then shut the thru-hulls
- ditto genset, if you have one
- ditto
air conditioning, if you have one
- run potable
antifreeze (aka pink stuff, RV stuff) through your freshwater systems (drinking water), "saltwater" (river, whatever) washdown systems, if you have one, hot
water heater, etc. This is the one where the system can be largely emptied with compressed air, and you may or may not need pink stuff at all except for your waste
holding tank. (A waste tank thru-hull should be closed, too.)
The light bulb idea is pretty good, though. Also, a low speed fan can help move that slightly heated air around, helps minimize
condensation. You could put a light and a fan on a timer...
If wintering in the water, you may need a de-icer... which usually keeps water moving enough that, along with the movement of the boat itself, means ice usually won't start lifting the
hull out of the water...
-Chris