A/C technician just left the house. Came across as real honest.
He said i was down 4 lbs in my top unit, but could only fill 2 lbs. He said my expansion valve would not allow more in and that there is nothing to be done short of an entirely new ac system in the attic. A new expansion valve would not solve a thing and he has only come across one defect in his many years.
He suggested I change the air vent registers from my current 3 section stamped unit with units from Lowes which would allow more air.
My question being, is there anything else i can do? Is he correct that replacing the expansion valve will not help?
Unit is only 6 years old.