Customer had concerns about evaporator coil dripping and possible drain leak, tested drain line for leaks and found no issues, found evaporator coil partially frozen up, also found condenser coil packed with grass and dirt, cleaned condenser coil and checked system operation, found system low on gas, charged unit with 2 pounds of R22 and made sure system is working properly. Found drain line dripping due to open hole in wall bringing humidity/heat from inside the wall into the furnace closet and causing drain line to condensate and drip. Informed customer about this and recommended covering holes in the wall. Double checked for dripping after charging unit and did not see any more dripping from evaporator coil. System is operational