We'll have a thermostat on each floor, if one floor is calling for heat or cold but the other two zones are OK, the variable speed fan on the blower will only need to run at one third the normal speed. There are dampers in all 6 of the ducts that leave the blower (2 per floor). The system will shut the dampers on the ducts that go to floors that are not calling for hot or cold air....
This system costs more to install but should cost a lot less to operate on an annual basis.
This system costs more to install but should cost a lot less to operate on an annual basis.
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