To avoid getting conned into buying something you do not need, you need to know and choose an air conditioner mechanic that knows his craft. The best way to avoid being duped is by having little knowledge about your air conditioning units. Knowing the parts and functions of your air conditioning unit and your HVAC system will make you know which air conditioner mechanic is right for you. Reputable companies will have several additional services offered other than repair services only. Hire a technician from a company that offers preventative services besides installation services. Another sure way to get a good AC mechanic is by relying on referrals. Since everybody uses an AC in their homes, they may have experienced varying services from the AC repairman. This makes them knowledgeable about recommending companies that gave them the best AC mechanics and companies with the worst services. Ask about the AC mechanic’s experience. If they have been in business for a long time, they must be good in their craft. A certification from a reputable institution will also help you get a good AC mechanic. A good air conditioner should offer a thorough home evaluation so that they can suggest a good unit for your HVAC unit. They will offer to do proper sizing using industry software known as Manuals-J for HVAC units and manuals-S to know the right size of the equipment and Manuals-D for the ductwork. This will help with the proper sizing of an HVAC system that an experienced AC mechanic will use instead of determining the square footage size. A good AC mechanic should offer to inspect your ductwork for leaks and insulation.