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An HVAC system for a plurality of zones comprising an air handling unit including a blower, a plurality of heating stages and a plurality of cooling stages. The air handling unit is connected via ducts to each of the zones, each zone having an air outlet provided with a two-position damper which is

An HVAC system for a plurality of zones comprising an air handling unit including a blower, a plurality of heating stages and a plurality of cooling stages. The air handling unit is connected via ducts to each of the zones, each zone having an air outlet provided with a two-position damper which is either open or closed and a thermostat for providing an input signal to a microprocessor. The microprocessor has outputs for activating motors to move the dampers and outputs for activating the heating and cooling stages. The system includes an automatic mode of operation in which the microprocessor controls the number of stages of heating or cooling which are energized in dependence on the difference between the number of zone therostats calling for heating and the number of zone thermostats calling for cooling.

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An HVAC system for a plurality of zones comprising an air handling unit including a blower, a plurality of heating stages and a plurality of cooling stages, said unit being connected via ducts to each of said zones, each zone having an air outlet provided with a two-position damper which is either o

An HVAC system for a plurality of zones comprising an air handling unit including a blower, a plurality of heating stages and a plurality of cooling stages, said unit being connected via ducts to each of said zones, each zone having an air outlet provided with a two-position damper which is either open or closed and a thermostat for providing an input signal to a microprocessor, said microprocessor having a plurality of output means connected to activating motors to move said dampers and a plurality of output means for activating said heating and cooling stages, said system including an automatic mode of operation in which the microprocessor activates said heating stages of said cooling stages and controls the number of stages of heating or cooling which are energized in dependence on the difference between the number of zones thermostats calling for heating and the number of zone thermostats calling for cooling equalling or exceeding a predetermined number.