Quote Originally Posted by ghosthunter View Post
Could be compressor but check if your freon is low. If it's low, you have a slow leak in your AC system.

BTW, are your aircon evaporator and condensers are clean or when was the last time it was cleaned?
It was cleaned a few weeks ago and at the same time the freon was replaced. Didn't notice any change in the coolness of the aircon.