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The floor plan, architecture, and orientation of a house play a large role on cooling and heating efficiency. Rooms with vaulted ceilings, the second floor, basements, and rooms that receive full sunlight are examples of trouble areas. These areas are usually too hot or too cool compared to more easily regulated rooms. The answer to solving this uneven heating and cooling issue is system zoning.

System zoning involves multiple thermostats that are connected to a control panel, which operates dampers within the ductwork of your current HVAC system. The thermostats in each zone open and close the dampers to maintain the desired temperature.
This system is handy for not only maintaining comfortable temperatures in main areas of your home but for reducing heating and cooling costs in unused rooms as well. All you do is shut the damper and the door.

According to the U.S. Department of Energy, system zoning can save homeowners up to 30 percent on a typical heating and cooling bill. With heating and cooling costs adding up to 40 percent of the average household’s utility bill, the savings that system zoning offer can save you quite a lot.
If you are interested in having a zoning system installed, a Bardi Comfort Specialist will be happy to offer a quote on your zoning system based on your family’s lifestyle.

Source: http://home.howstuffworks.com/home-thermostat4.htm