I'm pretty sure Stockton summer temps are above Florida temps most of the time. Stockton, IIRC, will get to 105-115F in the summer - same as Sacramento. Florida doesn't often get over 100F ambient (?), but they do have higher humidity. At least that's what I remember from visits to my relatives there years ago.
The dropoff in performance with Duracool (and similar products) gets more severe the hotter it is. It might be tolerable at 100F, but at (for example) 110F, ugh. Then again even an R-12 system is struggling at those temps. Mercedes seems to have undersized the AC systems in most of their cars, even the newer ones. Probably because Germany doesn't have bilstering heat like certain US states do!
