mik said:
I have a mid 70's d-25 that hardly gets played anymore. Is it ok to let it hang on a hook in my guitar room or leave it in the hard shell case. I'm in Minn. so humid in the summer and more dry winter. Thank you. Mik
It doesn't matter much. In the case or out it will soon have the same humidity as the room it is in.
Put it in the case if you want to avoid accidental damage, and perhaps to buffer sudden swings in temperature or humidity.
Leave it out if it is in a safe place and you want to look at it, or maybe play it!
Choice #3 if you are not going to play it- sell it.