It’s hard to give something exact, but here are a few things. BTW, what is the temperature of the air coming out of the vents? What are your high and low side pressures when running the AC?
I assume you put the correct amount of refrigerant and oil in the system. If you are not sure of that, it’s a good place to start since some AC systems are very sensitive to how much refrigerant is added. Also, how are your blend doors working?