An air conditioner (or commonly referred to as an air conditioner or air conditioner) is a home appliance, system or machine designed to change the properties of the air (usually temperature and humidity). ) to the desired extent in a given area such as a house or inside a car. In a conventional sense, an air conditioner is a machine that lowers air temperature. Refrigeration is carried out according to the cooling cycle, but sometimes evaporation cycles or free cooling or desiccant  are also used. In construction, a complete heating, ventilation, and air conditioning system is called “HVAC”, which stands for heating, ventillation and air-conditioner features.