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Reply to "Cost to add a second HVAC zone"
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[quote=Anonymous]I spent a lot of money (about $15K) to add a second, upstairs zone. That included cutting off the main trunk line to the upstairs, installing a heat pump in the attic and connecting it to the existing vent and intake lines. It did not help. The heat pump seems to be under-powered and cannot seem to keep up. Although the heat pump is supposedly sized for the space, my theory is that hot air rises so the heat pump has to do a lot of the cooling in the house. So now, the heat pump is on all of the time and upstairs are never below 80. The installer warned us against getting a bigger heat pump because it would supposedly run ineffficiently [/quote]
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