How to protect humidors from winter dry ??

I know of several people using kitty litter with satisfactory results. it does take a little time and effort to achieve desired RH levels. But, it seems the main reason for KL use is cost comparisons. Humidity regulating (cigar) beads are definitley more expensive per pound, but how often do you need to buy them? You spend hundreds and even thousands on your cigars, dont F around with your humidity control. KL absorbs excess moisture, but doesnt really release needed. you have to mess around with it to get levels of RH you want. I reccomend using something designed to regulate humidity,up or down.