who added feron to your air conditioner? your situation is the same as mine. Somebody added feron to my air conditioner about more thanone month ago, but it did not work last week.
This is 2nd floor again. Kevin just fixed mine by changing evaporation coil (it leaks freon). A technician from big company pushed me to change the whole system.
Kevin is on vacation as I was told. He is really a professional and a nice guy.