I have just have trane dealer to install a new trane seer 12 AC, plus new coil and new furnace on July 5th. Within 10 days, the AC won't pump enough cool air to cool down the house and the humidity kept at low 70% and could go down. So on july 17th, I called the installer and he came by and checked outside AC unit and inside coil and found no leak. He then put more freon into the new AC and he called "boost shot". Since then, the AC has been running fine. I can get the temperature that I want and plus the humidity has been kept around mid 50%.
I am living a 2000 squre feet house in southern Illinois and new AC unit is a trane 4 ton seer 12.
I am really confused at what happened before. Does anyone here have an explanation about what that might happen on my new AC at its first 10-day's operation?