Taking care of your traditional piano
Play your piano. In addition to giving you joy, pianos need to be worked out to stay in good condition.
Try and get your piano tuned at least twice a year. Not only do seasonal changes require it (especially in New York City), your piano technician can spot potential issues before they become expensive and permanent problems.
As humidity is such a major contributor to tuning and regulation issues, it is best to try and control it as much as possible. However, that is not such an easy task unless you live in a museum. A good rule of thumb is, what’s good for you is good for the piano. Especially in the winter, as the difference between the outside temperature and indoor temperature increases, try adding moisture to the room with a humidifier, or turn down the heat so the difference is not as great. Your skin and your piano will thank you.
Keep the piano away from direct heat such as a radiator or heating vent. This is very important. Although not as important, try avoiding drafts from windows or doors. Also, having the piano situated by an inside wall is preferable to an outside one.
Keep the piano away from direct sunlight as it can ruin the finish and cause tuning issues. Curtains or venetian blinds will diffuse the sunlight enough.
If you are interested in learning more about your piano and piano care, I highly recommend picking up a copy of “The Piano Book” by Larry Fine. Although it was written for people who are looking to buy a new or used piano, it has information about the piano that is useful for just about everyone.
With a top rated digital piano, much of the above becomes unnecessary.