Yes, you need multiple zones if the heat gain/loss is not uniform in the house, otherwise you will see temperature variations.This can be achieved in one of two ways. The first is multiple systems. The second is a single system with dampers in the duct work to vary the air flow to each zone. The latter generally requires carefully designed duct work and may be problematic if trying to retrofit existing duct work. The Carrier Infinity system is an example of an intelligent system that supports multiple zones with a single airhandler/condenser.
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Originally Posted by Retiring
When I was being shown around some new construction homes in TV, 3 of the 4 homes I was shown had a second heat pump dedicated to the master. I guess that’s how they’re handling that issue these days.
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