For 2-3 years we had noticed that our house did not cool down adequately on hot days. After a recent hot spell, we decided to call an HVAC company to check it out. After finding AAA on Angies List, we made an appointment. On the day of the appointment, Monty arrived on time. He checked out the system, and told us that the refrigerant was low, and that this was probably the cause of our cooling problem. This made sense, and we asked him to service the unit. Within an hour, the refrigerant was recharged. From then on, we have noticed a big improvement in the AC, and it appears our problem is fixed.