Which is the best model for subtropical south Florida?

For your area, you may be better off with ACiQ-48-EHPB / ACiQ-48-AHB rather than ACiQ-48-AHB / ACiQ-48-HPB. The extra level of heating provided by the ACiQ-48-AHB / ACiQ-48-HPB may be unnecessary unless you think your area may drop lower than 5°F at some point, but it does not seem likely that it will. Sticking with ACiQ-48-EHPB / ACiQ-48-AHB is likely the better choice for you.

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