My A/C isnt working right!! HELP!!!?

My a/c seems to constantly run and doesnt cool down!! The maintanance people in my apt complex looked at it and sent an a/c guy out. he cleaned it out. still had probs. yesterday, I set my thermostat at 80 bc I left. I returned 8 hrs later and my a/c had been running ALL DAY and my thermostat said it was 78?! I have a clock that also tells the temp and its under a fan in my living room...It said that it was 86 degrees. They said that the a/c system outside was tired out and that they were going to replace the whole unit and with it came a new themostat. i came home yesterday and it seemed to be fine (new unit and thermostat working!). today when i went to wk i set it at 80. came home and put it at 78. 6 hours later...its 82 degrees inside?! new thermostat, new a/c unit outside, new coils, new air filter, cold air blowing out, freon okay. WHATS WRONG WITH IT?!

My A/C isnt working right!! HELP!!!?
Wow! I know your pain. I have has similar problems. I would continue to call the apartment office and complain. It is their job to fix it. Could you be losing air anywhere? Like airspaces around your door or windows? I wish I could be more help.
Reply:needs to be recharged and checked to see if coolant is leaking.
Reply:just crank it down to about 60 degrees for an hr or so like i do. My AC does the exact same thing. No one can figure out why either but, i found when i turn turn it down to about 60 and let it run for an hr or so, it works much better. . Idk y. lool. Just telling u what works 4 me. hope it will work 4 u 2.
Reply:I just reread your question. You have it set at 80, then put it at 78.6, and it is 82 degrees inside? That is perfectly normal. You need to turn the AC down to 70 or 72 at the most to get any sort of cooling going on. 78 and 80 setting and an indoor temp reading of 82 is perfectly within the norm.