So after reading about the Orange County coconuts somewhere around the Santa Ana area and especially the one in Corona that persisted for years I thought I'd give it a try in zone 10a in Fallbrook in northern inland San Diego County. I'm about 15 miles inland and get a lot of heat. Might have to put a popup greenhouse around it first couple winters during cold or near freezing nights. Basically where I am in Fallbrook is sunset zone 23. Highly thermal even in the winter. It seems almost every year we have a lot of hot dry Santa Ana winds in the Fall and throughout the winter well into spring so its been warm a lot. Last winter we were mid 80's for weeks on end even a couple days in early march into the 90s consistently enough even my bananas started pushing new leaves in late March. Nights sometimes cool off quick but rarely freeze.

I was noticing this year north of us in LA it was even warmer than my location doing work there in the winter felt actually kind of hot during mid days in what seemed like well in the mid to upper 80s in the middle of winter. For those who live inland southern California it might be worth trying. I'm surprised these aren't attempted inland LA basin more often where they get a good deal of heat, less freezes and generally just benefit from the heat island effect. I assume if you have a hot south facing sheltered pocket on your property it could work if you're far enough away from the cold ocean water which really stunts these guys.

I planted this little guy (Malaysian Dwarf) in the middle of a heatwave its been in the upper 90's low 100s outside during the day hardly getting under 70 at night. Our nights recently have been basically tropical because of the north American monsoon humidity hanging around but also the offshore ocean water has been in the mid 70s. Here's a bunch of thermal reads even the retaining wall is in the 90s in the shade at 11am. The ground mount solar is pretty close by should offer some decent reflected heat. This little spot sees full sun even during winter solstice for pretty much almost the whole day since it's south facing and is sheltered by a little hill a fence and huge trees to block cold winds. You can see the dwarf cavendish banana doing really well behind the coco. I'm seeing wet soil over 100F so to me it seems this spot builds some serious heat.

@FallbrookPlantGuy Wishing you the best of luck with them! They're gorgeous when well grown.