The first thing we check is how cold your AC is blowing. If the temperature isn’t cold enough we use a machine that pulls out all of the freon in your system. We pull out, measure and weigh it. Unfortunately there is no dipstick for freon. If your system is full we then check to make sure the compressor has a good signal. If your freon level is low we introduce nitrogen into the system to duplicate freon to see if we can find any leaks that need to be repaired. Once everything is looking good the freon goes back into the system. Now you rest assured your summer will be nice and cool.