If a piano is moved from one room to another within a uniformly heated house, then it is unlikely to go out of tune (even if it is being moved up or down stairs). Again it comes down to environment and atmospheric conditions. Moving a piano - contrary to popular belief does not usually make a piano go out of tune. Controlling temperature and humidity therefore plays an important part in preserving your piano If these variations become too severe it can ultimately lead to the soundboard cracking which becomes a very expensive repair option. The strings therefore tighten which causes the pitch to raise and the piano is then out of tune.During the winter if heating is used, the moisture evapourates from the wood which therefore shrinks and the strings slacken and the pitch drops, again resulting in the piano being out of tune. During the warmer months the atmosphere is quite humid and 'water laden' and the wood absorbs this and swells.

The steel strings bear down on this soundboard through 'bridges' which in turn allows their vibrations to be amplified.Ītmospheric changes - Due to the very nature of the whole construction, pianos are very sensitive to atmospheric changes in temperature and barometric pressure. Spruce is used because of its elastic nature the more elastic the soundboard the more pleasant the tone. This board is made of spruce and is responsible for the resonance of the piano. Another primary cause is the movement in the soundboard.

In older pianos, the primary cause of strings slackening is the tuning pins which are embedded in the wrest plank (or pinblock) become loose either due to general wear and tear over the years, or (more commonly) because the wrest plank has developed splits across or around the pin holes due to the wood drying out.

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