On Oct 21, 12:56*pm, Andy wrote:
..

I think in my mother's situation, the pleated filters restricted the
air flow so much that the coils froze up.

Maybe the newer units are engineered to use pleated filters.

If the coils are freezing up it's probaby because the coils need to be
cleaned.

In my current home which I bought in '02, the air handler was
(replaced it in '05) 18 yrs old and ran fine with pleated filters.