For the last 20 years I have left all my guitars out. I have a whole house humidifier plus individual humidifiers on the acoustics. An old local Martin repairman told me once that it was sudden changes that were damaging. If you were comfortable, so were the guitars. My Martin is nearly 50 years old and has some aging and minor checking. At nearly 50 years old it’s beautiful stuff. Look carefully next time you see a 50s Gibson or Martin on “GOTD”. Lots of checking going on. These are man made wooden things that will outlive most of us. I say put them on the wall so you can savor them and play the crap out of them.