Winterization in the Sun Belt

[bacampbe]

Since we've had some threads on winterization:

What do people in sun belt areas do for winterization? My boat is on Lake Lewisville, on the north edge of the Dallas area. We do get a few hard freezes a year, but not that many. Anywhere from a few nights in the 20s to a couple of weeks in late Jan or Feb. Occasional teens (not every year.) The lake water pretty much never freezes.

On the other hand, any given month in the winter is likely to have a few good sailing days, so we certainly don't want to take the boat out of commission.

I'm in a marina with shore power, and have a reverse cycle A/C (which could both freeze and protect the boat from freezing, depending on how my luck runs) , fresh water tank, and a marine head with holding tank. I never had to worry about this with my old boat, as it didn't have anything to freeze.

I've gotten a few suggestions from marina neighbors to put in one or more portable electric heaters with an "antifreeze" mode. Is that the best approach?