The frost free means when we use refrigerator,it does not need to defrost manually,but it doesn't mean the refrigerator is "no frost"
About Haier model with frost shield system, it does't mean frost free, it could only reduce about 70% frost. So in summer, for the freezer with this system ,it can defrost every three or four months.But for the manual defrost freezer without this system,it need to defrost every month.