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Heating, Ventilation, and Air-Conditioning (H.V.A.C.) is a climate control system. Described here is the HVAC system for home or small office. Older systems heated the air and passively allowed air to circulate. Modern heating and cooling systems actively circulate the air with blower fans. Heating, Ventilation, and Air-Conditioning (H.V.A.C.) is a climate control system. Described here is the HVAC system for home or small office. This type of system is known as '''A Split, Forced Air Heating and Air Conditioning System'''. Older systems heated the air and passively allowed air to circulate. Modern heating and cooling systems actively circulate the air with blower fans. == Heat == == Air Conditioning (Cooling) == The same motor, blower, and duct work used for heating are used to distribute cool air from the air conditioner in a forced air system. The two main components of this system is the condenser (outside) and the evaporator (inside, also called a-coil).