An air conditioning system is a popular extra and is installed in almost all new cars. No one wants to miss out on cooling in a car when temperatures are high in the summer. Besides, air conditioning systems contribute to driving safety: A driver's concentration diminishes noticeably at high temperatures. Moreover, an air conditioning system also helps to clear misted-up windows in winter. Nevertheless, if the air conditioning is set incorrectly or poorly maintained, it can result in colds and circulatory problems.