thanks for the reply. i read some of your suggestion to others and came to the conclusion that the air handler unit ( i guest it has the condenser coil in it) needed to be cleaned. so i went ahead and called for help and i'm happy to say that you were right! service man checked everything from psi to leaks, and everthing passed. it's been 2 days now and a/c unit seems to be working fine for now. We'll see how thing pan out this summer, it's really hot down here in Miami!