I don’t know how huge a deal it is, but I have a Fullsicle (Harpsicle), and I keep the levers down unless I’m playing it. I also tune it levers down first now (I didn’t do that orignally when I first got it), then check to see how things are and adjust if needed. I don’t currently store it in my case, but I have finally invested in a humidity/temp monitor and will be getting a humidifier soon in case it’s needed. I use one of those (what are they, damp its?) for my fiddle, but I hear many violinists aren’t too keen about putting something that has water soaked foam like that inside the wooden instrument itself, so some just find ways to humidify the case itself. Anyway, that said, I’ve noticed my harp is less cranky about temp and humidity changes than my fiddle is – those 4 pegs have been a nightmare for me, as they are all wood on wood (instead of metal turn-pin setups like my harp has)…. during one very huge “blue norther” that came through the area a few years ago in Texas (temp dropped 10-20 degrees in a short time), my fiddle’s four tuning pegs all spoun out, dropped the bridge, and the post inside fell. A luthier had to fix it. Now, if a HUGE cold front change moves through or I have the windows open on chilly days like that, I will move my fiddle (in the case) to an inner closet…. never have had to worry much about my harp. Yet. It did make creaking noises when I first got it and tuned it, and it stretched out to the belly-warping stage… but it’s been quiet ever since. The biggest issue I have ever had with my Harpsicle/Fullsicle was during the summer Random Acts of Harping (and this was in the Texas morning in the best shade I could find… still… hot!) my harp didn’t seem to want to sound tuned and my fingers slipped on the strings. I can’t speak for all harps, but it did seem to handle it better than my fiddle ever has. That said, you will learn to listen out to changes in it, and always keep it away from light, heat, and drafts. And probably not a bad idea to give the levers a break and keep them down when not played. But that’s my unskilled, self-learned, over a couple years I’ve had a harp noticing in my area. Good luck!