I have two Courier AC, one for downstairs, the other one for up stairs, both are only 3 years old, pretty new.
Recently I notice that it takes quite long for the upstairs to cool down.
Today I get a AC technician to come over to have a check. He found out that
the puron pressure in outside compressor unit is low, about 65 (psi??). He told me that it should be about 140 if working properly. By visually checking, he could not find any leak place outside. He went to attic to check the coil in the furnace, it is very clean after opening the furnace box. Without any instruments, he could not find the leak, he guess that there might be leak in the coil. So he suggest that I replace the coil, since my courier equipment warranty will cover the parts for me, I only need to pay the labor. Temporarily he recharged the puron for me and it is working fine now.
I am hesitating since he could not pinpoint the problem and the leak location.
My question is
1)Should I replace the coil without knowing whether it leaks or not? Should I stay put, since the AC is working properly after puron recharging
2) what is the general rule to find how to find the leak location?
Any advice, comments are greatly appreciated