I heard of Nicholson's Heating & Air through a friend. When we noticed a leak in our air conditioner, we decided to call them to fix it. The employees that came out were very friendly and respectful of our house. They evacuated everything out of the air conditioner and then recharged it. The leak was fixed and we have had no future problems with it. I would definitely use Nicholson's Heating & Air again, and I suggest you do the same!