Here in SW Pennsylvania, we tend to have cold drying winters and very humid summers. Wood reacts to changes in humidity and temperature. This causes the piano to go flat during the winter and sharp during the summer.
Pianos in the home should usually be tuned twice a year to correspond to the changes in weather. However, if the home has whole-house air-conditioning, or if a humidity control system such as a Dammp-Chaser Piano Lifesaver System is installed in the piano, tuning frequency may eventually be reduced to once a year.
Although it may seem counter-intuitive, it is true that the more often a piano is tuned, the less often a piano will need to be tuned. More frequent tuning will tend to stabilize the piano. Thus each time the piano is tuned, the adjustments should become smaller and smaller, leading to greater stability and creating the foundation for finer and finer adjustments.
If the budget is limited, the the piano should be tuned annually at the same time each year.
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