Pianos go out of tune primarily because of changes in humidity. Tuning can be made more stable by installing special equipment to regulate humidity, inside or underneath the piano. There is no evidence that being out-of-tune permanently harms the piano itself. However, a long-term low-humidity environment may eventually crack the soundboard and warp keys and other wooden parts. In particular, pianos located in arid climates and otherwise very dry rooms (for example, a cold climate with an extended heating season) require special attention to humidity control.
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