An air conditioner’s filters, coils, and fins require regular maintenance for the unit to function effectively and efficiently throughout its years of service. Neglecting necessary maintenance ensures a steady decline in air conditioning performance while energy use steadily increases. Why should a car’s air-conditioning system be serviced? Over time, the network of compressors, driers and piping leak refrigerant. This is the crucial ingredient that makes every air-conditioning system work. Typically about 10 per cent escapes each year.