As a rule of thumb, a residential air conditioner ought to be serviced annually and will cost anywhere between ₤ 70-₤ 120 per indoor system. http://solcaribe.com/__media__/js/netsoltrademark.php?d=vuf.minagricultura.gov.co%2FLists%2FInformacin%2520Servicios%2520Web%2FDispForm.aspx%3FID%3D10580191