Selecting an air conditioning contractor is the most important aspect when considering a complete HVAC replacement or even minor repair, service or maintenance. In addition to questionable sales and marketing practices, competence may also be an issue. Some manufacturers reports that as many as 30% of warranteed parts have actually not failed. This means that often times a wrong diagnosis is made. Contractor selection can be the difference of thousands of dollars of the life of your equipment. Below is a list of qualified air conditioning contractors across the United States who are proven, qualified air conditioning companies.