| Besides
tuning your piano on a regular schedule, the best
way to improve tuning stability is to reduce the
changes in humidity that occur in most homes. Using
an air conditioner in humid summer months and adding
a humidifier to your central heating system will
reduce the extremes of high and low humidity and
improve tuning stability. However systems designed
to be installed inside of pianos will control humidity-related
disorders still further.
Installing a humidifier/de-humidifier system
inside the piano keeps a humidity level of approximately
42% relative humidity. In new instruments, this
helps keep moisture in the wooden parts of the
instrument. The soundboard flexes through moisture
gain and loss, pushing against the bridges and
strings, driving the instrument out of tune. By
controlling the humidity level around the soundboard,
the system promotes tuning stability during seasonal
humidity changes.
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