Where is it can you find the best HVAC contractor?
You could start by looking at the Air conditioning Contractors of America also known as ACCA. This is known as a non-profitable organization which is comprised of a total of over 60,000 professionals and around 4,000 different businesses. Since these businesses have been found to be in good standing, you should be sure that they are going to be able to provide you with very good referrals from some of the previous jobs that they may have handled before.
Another option could be going ahead and taking a look at Angie's list since you can be able to find differ ratings of websites and consumer reviews here.