It's all 3 counties here (Marion, Sumter and Lake) who made it so that as of Jan1, 2015, the room and its ventilation and windows would have to have the more energy efficient, higher level (class 4 or 5) insulated and heat blocking windows and ventilation in order to be allowed to install the dual AC-heating unit. A patio enclosure contractor ad said this a couple of weeks ago but I can't find it now.
It's about protecting the heating cooling loss and resultant waste of energy, as I understood it. Not a Villages mandate, but counties'.
Ask a contractor for an estimate and they'll tell you how it can be done.
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