2 furnace pm check complete. Tested mechanical and electrical components, all in good shape. Customer has asthma, recommend apco air purifiers to help keep evaporater coils clean, prevent mold and to kill bacteria, germs and viruses for improved air quality. Systems are heating normal at this time. Insulation levels are low, recommend adding more in for improved comfort and efficiency. Changed upstairs filter with filter customer provided. Did not change main level filter.