said by Mr Matt:
The point that the zone control manufacturer was making was that the zone control system allowed the architect to specify one 60,000 BTU central AC rather than three smaller central AC's to meet the architect's requirements. I should have mentioned that I saw the demonstration system before the 2007 recession. I am sure that two additional smaller central AC systems cost many $$$. The other point that was made was lower maintenance cost of only one system.
also single point of failure.--
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