Don't be tricked by the under $30.00 tune up. Most contractors that offer this type of tune up are hoping to find parts to replace. In some cases the technicians are paid a flat rate fee based on the repair cost. Think about it for a minute, how can a contractor send a technician to your home for $30.00 and cover his costs? The $30.00 has to cover the technician's hourly cost, travel time, vehicle costs and overhead. Be ready for a sales call, not a service call.  A good tune up will cost $60.00 to $100.00 and will include a thorough diagnosis of your air conditioning system.  If you invite us, you will be greeted by a certified service technician, not a salesman.