I was called to a home to check on a unit that was not cooling. I arrived and found that the unit was not cooling due to a dirty air filter. I cleaned the filter and checked the pressure on the system. I found that the pressure was low and that the unit needed to be recharged. I also found that the unit had no power coming up to the unit. I checked the breaker and found that it was tripped. I reset the breaker and the unit came back on. I also checked the unit for any other issues and found that the unit was working properly.