They're Very shady I regret the day I hired them its been a nightmare. Beware they don't obtain building permits. How do you know that the work complies with the building code? You've picked a contractor that says they have been in the business for many years, so you figure he must know what he is doing. But does he? With a building permit, at least there is a second set of eyes looking at the work. Faulty installations can cause fires, flood damage and other hazards, and also force you to make costly repairs when you sell your home. They also don't preform Manual-J load Calculations nor Manual D Duct Design and they aren't Nate certified.