Air Conditioning and heating installation and repair service for Porterville, CA and anywhere within 100 miles. Zone Air Conditioning has over 23 years of experience in the trade of HVAC (Heating Ventilation Air Conditioning). Zone Air Conditioning was started in 2006. The main reason why I started my own company was that of the poorly designed air conditioning and heating systems. I was not happy with the duct designs and the layouts that were installed throughout residential and commercial buildings. Many people would complain about how their systems did not run correctly. Several companies were convinced that their systems were functioning efficiently. I find that hard to believe. My company has fixed many ductwork systems all over town.