The purpose of an air conditioner is to control and maintain the temperature, humidity, and air quality in an indoor space. It does this by cooling the air in the summer and heating it in the winter (in the case of a heat pump or HVAC system with both cooling and heating capabilities). Air conditioners can provide comfort, improve air quality, and protect electronic equipment and sensitive materials from extreme temperatures and humidity. There are several different models of air conditioners, each designed for specific purposes.