This company is highly knowledgeable of different brands of air conditioning and heating units. I did much reasearch before getting estimates on such an important investment. Mast Air INC gave me a very competative price and all the information I needed before making the decision to have them install a new a/c system. The person who came to give me estimate was very thorough and gave me different options that would work for my cooling needs. The installers were quick and cleaned up after themselves. I am very happy I chose Mast Air to replace my a/c unit!