The frost free means: when you use the refrigerator, you don't need manual defrost normally, not mean the refrigerator is “no frost”. If the condition is bad enough, maybe the refrigerator needs to be defrosted.
For Haier frost shield system, this is not frost free, it can reduce frost by up to 70%. Then in summer, you need to defrost every month for no frost shield system freezer, but you can defrost the freezer that has the frost shield system every 3 months or 4 months.