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The 2006 is not designed for ducting the front AC nor does it use zones despite the thermostat. Our thermostat says the same thing. Our 2007 is the same way. It is not ducted and thus can't be zoned.
The second AC prep option includes both the wiring and the framing.
This is our first summer with the second AC. We find that many days we can run just the front AC and it will keep it comfortable downstairs, as well. And downright chilly upstairs. We also set the thermostat for the downstairs AC and it will turn on and off as needed. It makes for a much quieter tv viewing experience except on those really hot days when both units run.
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