General Info: Purchase Advice: Do I Need Heat?

[JimInSoCal]

Hi all, new here and considering the purchase of a new Lagoon 40 that a local dealer has as a stock boat.

Unusually (as best I can tell), they ordered it without a genset, A/C or perhaps most importantly, heat.

And based on that, my question is this - I'd actually rather add solar and extra batteries and not deal with a generator if it's avoidable, so I'm otherwise fine with that, and it's not often hot enough here to want A/C (I very rarely need it even on land), but I'm concerned about cold when it gets down into the 50s (often) or 40s at night (less so but enough to take into consideration), and the average water temp gets down to 60 here compared to 68ish in the summer.

I don't plan to move aboard anytime soon, but do certainly plan to spend nights on board for a week at a time or more when tootling down to San Diego or out to Catalina, etc., and if I'm going to freeze my tail off without heat installed, I want to make allowances for that up front.

At what temps are folks finding they need to use diesel, electric, or other heaters to keep the boat warm enough for comfortable sleep overnight? I'm kind of a hot sleeper (I usually tend to have the AC in hotel rooms at 68), so I might like it cooler than some other folks, but there's obviously a limit.

Any and all thoughts appreciated!