Same area here. We use ours year round, although some nights in Winter season we do not after cold fronts move through and we have NW to NE winds for a few days post-passage. If you do opt for it, you'll notice that the cooler water temps during winter here, (65-75 degree spread) allows the unit to cool much more efficiently than in summer when water temps hit near 90. At that point, the A/C runs darn near constantly. (Remember, it takes raw water thru the circulating pump and water temp affects it's efficiency.)
During the hot months here, it's also important to select realistic set points on your digital thermostat. Toggle it down into the hi 60's, and the unit will keep shutting on-and-off to cool itself down. We run ours at 76-78 and that feels perfect when you step down into the cabin in the summer.
We don't fish; we just cruise and overnight. No A/C would have been a deal-breaker for us here in Fla. We consider it essential on our Marlin.