Spring Residential Air Conditioning Maintenance Service. Came out on 2 system maintenance Checked pressures checked temp splits checked drain lines changed 20x25x1 this visit 20x25x4 is OK still checked bearings checked blades checked contactors checked capacitors checked Amp draws checked electrical connections checked insulation levels checked ductwork Found Low insulation levels Dirty ductwork No surge protection on 3 pieces out of 4 No IAQ Customer happy on departure.