Getting an expert to conduct a general investigation of your heating and air conditioning system is very important. This is because your general contractor can ensure that you are getting the best service for your money. He can help you determine the causes of the problems, and what needs to be done to resolve them. Most people like to fix their issues themselves, but this can become problematic if the issue is serious. A qualified heating and air conditioning repair contractor will look at your entire system, not just the part that needs work.