Cabin air filters are probably the best invention since popcorn....well almost.
In Texas A/C is a down right necessity in the summers and one has only to deal with replacing the cab air filter rather than paying an A/C shop 100 bucks an hour to tear apart your dash just to clean the evaporator coil.
Settin in traffic in 100 degree heat with a froze up evaporator will make one bless the day someone came up with a means to filter the air before dirt, dust, dander and dog hair plugs up the coil.
Just my Dos Centavos !