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Heating, ventilation, and air-conditioning (HVAC) are an energy-efficient technology of vehicular and indoor environmental comfort. Its aim is to offer satisfactory indoor air quality and temperature. The term HVAC can be used in several ways as “heating, ventilating, and air-conditioning” (HVAC) systems are generally described as a set of equipment that can control and condition the indoor environment to provide a comfortable environment for the users.

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The main components of HVAC air heating and ventilation systems. They work together to optimize the utilization of space and to effectively regulate temperatures. The role of heating and ventilation is to effectively provide energy for the HVAC appliances to function while cooling is needed for keeping indoor temperatures from getting too high or too low. Heat absorption is achieved by the application of surfaces or air ducts to heat up or cool down air, which transfers it from the source through the vents to the spaces that require heating or cooling. Cooling is done by the same application of surface or air ducts to the spaces that need cooling. In some HVAC applications, exhaust fans may also be employed for providing ventilation and heating effects.

Basically HVAC systems are comprised of four major components such as the heating, ventilating, and air-conditioning (HVAC) systems. However, a separate space called the “exhaust” is also part of the complete HVAC system. The purpose of the exhaust is mainly to remove excess moisture and odors produced by combustion sources such as oil, gas, coal, wood, or other types of biomass. The air-conditioning component of the HVAC system cools the indoor air by employing principles similar to that of the cooling fans in refrigerators. The ventilation system allows fresh air to be drawn into the HVAC system. A thermostatic controller regulates the temperature of the indoor air to ensure safe temperatures for the occupants.

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