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Thx Dash, yeah it is more costly going up to 3-4 zones from 2. My Tech recommened 2 zones as an option, for comfort and just slightly better efficiency, but not for an real increase in ROI. He said...

Posted a detailed description of situation before but was likely too long & confusing.

Anyway, Well built, insulated and efficient house in central Texas has a first floor of 2740 sq ft. About 600...

New here. Great forum BTW.

Live in 2740 sq ft house in hot ole Tejas. Big living room with vaulted ceiling, rest of house is 8ft ceiling, tons of windows/glass doors. Both heat pump split systems...