Sam, how's the indoor relative humidity doing in your piano room? Or do you not worry about it?
I definitely pay attention to it. On my old Bechstein I had a full Dampp-Chaser system, humidifier and dehumidifier. I got one of those Acurite temperature/humidity meters and watched the humdity in the room. All winter I was in the good zone. So no need for adding humidity, and filling that tank on the humidifier was a chore. The summer is a different matter. At first I had nothing on the new (to me) Yamaha grand, but as soon as summer hit, the tuning went sour. The room will vary from 55-65% humidity. Outside is 70-80-90+. So I added two dehumidifier bars under the Yamaha. I also got an "Inkbird" humidity meter with a remote sensor, which I placed on top of a beam under the piano. The one thing about the Dampp-Chaser that they really need to improve, is some indication that it is actually doing some good. The Inkbird tells me that the humidity below the soundboard is about 10% less than the room humidity - that's the best that it will do. That seems to be enough. The piano keeps a very stable tuning, which is what I want.
Power's back on!