a/c issues

I have searched for this issue in the forums but have not found the particular issue. Every year I have to put a can of a boost into my system to get it to work. This year was no different but unlike previous years it did not work. I had the system checked and it was over pressure. So I had it removed and filled from scratch. I found the proper amount of oil and 134 here on the forums. I had the system charged and still no luck. The compressor is running and is NOT short cycling. But I am still not getting cold air just the same temp that's outside the car. I checked cabin air filter and replaced it but I had a feeling that would not solve the issue. Any suggestions on what I should do? I have a 2007 aveo Lt.

Thanks.
John from Kentucky