Arrived on site for heating maintenance on 2018 Goodman with electric heat. Began inspection at the indoor air handler and found large amount of growth on the inside. Evaporator coil looked clean and filter was recently replaced. Tested blower amp draw.I noticed a large amount of bacterial growth and dust buildup on the blower wheel. I recommend cleaning this to reduce stress on the motor and prolong the overall life of the motor. I then tested the electric strip heat and measure 20 A on all legs. I also measured 100° air coming from the supply. Upon inspecting our unit, it was found to have a large amount of dust and debris in the bottom. I took some extra time to make sure to clean as much of this out as possible for when we go into the cooling season. Unit in good working order upon departure. Schedule blower wheel cleaning end of January