Just put a portable dehumidifier in the room and set it to run automatically and have zero worries. Keep the albums 12 to 18 inches or so off the floor . (cinder blocks)
You have to be vigilant to keep mould from getting in the cardstock of the sleeves, and the paper inner sleeves then migrating into the grooves. I have over 8000 stored in the basement and have for a couple decades like this with out issue. It doesn’t have to be really humid as posted above. Its the CONSTANT accumulation over time that makes things musty/mouldy quick. Cheap dehumidifier is pretty inexpensive insurance and up off the floor will save from the rare and off chance of a foot of water in your basement should you not have a sump pump or it fails to start. Many people never check them and just assume they are in working order.
You have to be vigilant to keep mould from getting in the cardstock of the sleeves, and the paper inner sleeves then migrating into the grooves. I have over 8000 stored in the basement and have for a couple decades like this with out issue. It doesn’t have to be really humid as posted above. Its the CONSTANT accumulation over time that makes things musty/mouldy quick. Cheap dehumidifier is pretty inexpensive insurance and up off the floor will save from the rare and off chance of a foot of water in your basement should you not have a sump pump or it fails to start. Many people never check them and just assume they are in working order.