HVAC "Smart" Zoning Controls HVAC "smart" zoning technology consists of dampers and electronic controls that attach to standard central air systems.  For the past 10 to 15 years, manufacturers have adopted commercial/industrial zoning technology for residential applications. An HVAC "smart" zoning control system divides the home into two or three zones, with a thermostat in each zone. It works with single-stage gas, oil, heat pump or electric HVAC equipment or internally staged, multi-stage equipment. The control system includes automatic dampers that fit into the ducts and a control panel that allows for the feedback of information between the programmable thermostat, indoor climate and damper position. The drive damper actuator assembly does not use wear- and friction-producing gears for damper control. Instead, a synthetic cord transfers the motor rotation to the lever arm. Flexible-link or air-driven dampers are considered more reliable than typical gear-driven dampers for controlling HVAC system zone output. Mechanical, electric, digital, or programmable thermostats by other manufacturers or by RP can be used.
Manufacturers of the system quote $1200 to $2000 or more for a system installed, depending on options and labor; separate components are about $200 each. It is cost-effective to install when the HVAC system is being replaced, or in new construction. Manufacturers claim that proper installation can result in 10 to 20% energy savings from thermostat setbacks that prevent over-conditioning zones. Comfort is more readily achieved in each zone, and additional, targeted thermostats are more convenient to control than those at a single location.
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The Sheet Metal and Air Conditioning Contractors' National America (SMACNA) and Air Conditioning Contractors Association (ACCA) oversee duct sizing and installation standards.
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Retrofitting into an existing system will entail some disassembly, although RP claims its system is easier to install than comparable zone control systems. If a barometric bypass damper is not used, proper duct oversizing is necessary to prevent equipment damage. | 
