Heating, Ventilation, and Air Conditioning (HVAC) are an energy-efficient technology of vehicular and indoor environmental control. Its purpose is to deliver acceptable indoor air quality and thermal comfort. The energy efficiency and operational techniques of HVAC appliances have improved tremendously over the years. This has reduced costs and operating costs, while simultaneously increasing the comfort and usability of the equipment.

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One example of HVAC equipment is heat pump furnaces which are now being used more widely for residential and commercial heating and cooling, in addition to home and recreational air conditioners. Heat pumps provide both cooling and heating services through a common system of refrigerant and gas flow. Some heat pumps operate with a thermostatic control, which provides precise temperature control. Other types of HVAC furnaces include forced-air furnaces and gas furnaces.

For commercial spaces, HVAC is usually combined with central air conditioning (CA AC). In this case, HVAC is used as a supplement to conventional central air conditioning systems. HVAC window units may also be used in condominiums or office buildings. As a rule, HVAC window units are installed only where windows provide direct access to the HVAC system and where additional space is needed for installation and operation of other HVAC equipment.