Cooling check on a down flow r22 unit ....water washed condenser ....cleaned out all the ants in her electronics.... changed the 20 X 25 X 4 filter ...the blower and coils were clean ...drains were cleared and summer treated with bleach tablets ....has a variable speed blower and the temperature drop across the equipment was 20 degrees.... no issues were found other than the ants ....system is ready for summer