Keep your piano serviced regularly. It's important to have your piano tuned at least once every six months, or when there is a significant change in the weather. Pianos generally go flat in the winter, and often go sharp in the summer. Keeping it in tune regularly will maintain the strings’ pitch and tension levels to where they should be.
Another benefit of keeping your piano in tune is being able to play in harmony with other musicians. The international standard pitch of today is A-440. When your piano is kept in tune, you can enjoy playing with your fellow musicians as well.
Try to maintain a fairly consistent temperature and humidity control in the room where your piano is placed. It's important to keep your piano away from its following enemies:
a. Heating register b. Air conditioning vent c. Fireplace d. Frequently opened window e. Direct sunlight.
To maintain the piano's finish, you may wipe the wooden cabinet parts using Murphy's Oil Soap. Avoid aerosol spray polishes that contain silicone. Your technician may also suggest a specific brand name depending on the finish of your piano.
Resist dusting the inside of your piano, oiling the moving parts, or using any sort of lubricants such as WD-40. Your piano technician will take care of all internal problems.
Play your piano often. Not only will you get the most enjoyment out of it, but you will also keep it in stable condition. If it sits too long without any playing time, mechanical problems may occur that you may not be aware of. So cherish your piano like it's a close relative in your family, and notify your technician of any funny stuff going on when making that next service call.