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There is a difference between being pre-wired for a second unit and pre-ducted for a second unit. I have a 2008 Big Sky and the second unit is an unducted unit added at point of sale by my dealer. Most after market or dealer installed second units are like mine.
The BR unit feeds into the bedroom. I can direct the flow toward the BR door opening into the front. The thermostat is internal to the BR unit only and not connected to the main thermostat.
It is my belief that unless your unit is pre-ducted, what is needed to retrofit an integrated unit is prohibitive structurally as well as cost.
To get a "zone" effect when the one main A/C unit won't keep up, we turn on the BR unit and the dump the main unit air directly into the living area. When the overall room temperature lowers to the point desired, we close the dump and resume normal operation.
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