There are some signs that a good AC installation San Diego service company will exhibit if they are really up to the mark.
You will be given proper respect as a customer if they are serious about getting business from you. They will be prompt in arrival for giving you an estimate and you will not have to wait un-necessarily.
Your home and your possessions will be given the respect that they deserve. They will never try to give you estimates for repairs or maintenance that is not needed. They will do a through inspection and if they do not you can be sure there will be surprises later on.
You will get upfront quotes and there will be no revisions or surprises. Most importantly they will want you as a long term customer and explain to you how often your air conditioner needs maintenance and what you can do to keep it running in a good shape.
You should definitely watch out for any signs of unprofessional behavior from the staff members of the company that visit you. This includes dirty overalls, filthy trucks and equipment. Not wiping feet before entering your home. Unpleasant language or behavior. They should always answer all your queries patiently and completely. You should also watch out for companies that are not willing to show you, their licenses and accreditations. As a customer you are entitled to check if the company that you are hiring is legal and if it has all the necessary paperwork that is needed to allow them to operate in your area. You should also make enquires if the staff members have received adequate training to service heating and air conditioning equipment.