Gave customer estimates on a 20 and 19 Seer Complete 4 Ton System. Keeping and flushing existing lineset. Customer stated that the returns were undersized and also wanted information on air cleaners as well. I made recommendations and discussed the differences. Ended up adding the polarized air cleaner, whole house germicidal purification system, and HEPA air cleaner to estimates. 2 main returns will be expanded to 16†and the 10†in the master bedroom will stay the same. We will add a 20x25 filter cabinet to furnace for the polarized media.