Big difference between "frost free" and "auto defrost". A frost free freezer keeps the coils separated from the food (or whatever) and defrosts them by reversing the refrigeration cycle periodically. As pointed out above, it also immediately runs its internal fan so that air admitted from a door opening is moved to the coils dn the frost deposited there instead of on the food packaging. I have frost free in the freezer part of my refrigerator, and it doesn't even harm the ice made by the ice maker. OTOH, the cabinet freezer (where I keep film) is manual all the way; it was quite inexpensive when I bought it, and that's been more than 10 years ago.