Have a look at Serge's special care suggestions:
Because you care for your instrument, we care for you and your instrument!
Tune your instrument at least once a year.
Because of its high string tension, a piano deteriorates more quickly when it is not maintained at concert pitch. The technician will also notice possible repairs or if attention is needed on your instrument.
These are the biggest enemies of your instrument. About 80% of your piano - more than 90% for harpsichords - is made of living wood, which can expand or shrink under changing humidity levels. Therefore to guarantee health and stability for your instrument, you will need to secure the ideal level of humidity, which is between 40% and 60%.
Buying a hygrometer is strongly recommended. This will indicate the level of humidity in your piano room.
Too damp (65%-100%): install a dehumidifier, a heat pump or a piano damp-chaser system.
Too dry (40%-0%): set your heating system differently (DVS, heat pump, central heating, floor heating, etc).
You will also benefit from a more comfortable and healthier home!
Leaving your piano damp-chaser heating bar permanently plugged-in. Too much dryness will split the sound board, loosen action parts and cause irreversible damage to your instrument.
Setting your instrument too close to a fireplace. This will dry out your piano.
Setting your instrument against an outside wall. This will create humidity problems.
Setting your instrument in a cellar or a garage. This will create humidity and mould problems.
Ralph Pyatt
Richie Singleton
Richard Mapp, Senior Lecturer and Head of Piano Studies, NZ School of Music