Suddenly it wasn't cooling as well as it originally did. There was condensation on the entire evaporator. I can hear the compressor kick in, and the air is blowing from the unit is colder than ambient room temperature, and the condenser is warmer than the outside air. I took it apart and replaced the run capacitor. I cannot identify why the evaporator would overnight be noticeably warmer. I assumed the unit is failing due to a worn compressor. I don't think the problem is dirt.