How does your air conditioning system work? It might seem mysterious, maybe even marvelous when you give it close thought. For thousands of years, people had ways to create heat, but they could not discover a way to “create” cooling as powerfully. Then, in the early 20th century, electro-mechanical air conditioning solved humanity’s quest to uncover the mystery of reliable cooling.
If you’re reading this, you’re confronting another mystery: why your air conditioning system isn’t providing your house with the cooling you need for summer comfort. You won’t need thousands of years to unravel this problem, however, because you can find the detectives to solve the case for you with a phone call.
One of the problems that can trouble an air conditioner is when the evaporator coil—the indoor coil of the system—freezes over with ice. When people see this happen to their air conditioners, they may assume it means the ACs are working too hard and creating excess cool air. But coil freeze isn’t a sign of an AC that’s working too hard. Usually, it means the evaporator coil isn’t able to cool 
