Arrived onsite for ac maintenance on 1 system. Homeowner mentioned noise from indoor blower fan. Could not recreate the noise. System worked well while there. . Checked all electrical. Chemically Cleaned outside coil. measured pressures for 410a at 120/245psi with 5 degree sub cooling with outside temperature at 81 degrees. Measured temperature drop at 17 degrees. Cleaned out condensate line. Removed 20x20x1 filter located in air handler. Installed 2 -14x28x1 filters in filter grill provided by the homeowner System running as it should.