I called several A.C. companies to find out why my A.C. was not working. All just wanted to sell me a new unit. I called DD Mechanical because a neighbor gave me their number. I'm glad I found them. Not only did they find the problem they fixed it for what I though was a fair price. They gave me so much information about my unit and how I could save money, I'll be sure to use them when I need a new unit.