"Forced air systems are those that use air to distribute the heat throughout the building. The system uses a series of ducts to carry the heated air to vents placed in individual rooms or other areas of your home. A thermostat activates or deactivates the system to maintain a desired, preset temperature. If the temperature drops below the setting, the thermostat activates the system until reaching the temperature, at which point it deactivates the system. The difference between most forced air delivery systems is the method used to heat the air. The most common types are gas or electric furnaces, heat pumps and central air conditioning systems utilizing electrical resistance heating elements."
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