The approximate 220 strings on your piano exert about 40,000 lbs. of tension on the plate and frame, and about 600 lbs. of down bearing on the bridges and soundboard. Seasonal changes in the humidity, as well as normal, decreasing static tension will cause all pianos to go out of tune. Depending on where you live, seasonal humidity changes, the quality and condition of your piano, and how frequently it is played, it will need to be tuned two to four times per year.
A regular tuning consists of tightening the pin-block bolts and bench bolts (and rim-block bolts in grand pianos), and a comprehensive visual inspection to determine if additional repairs or adjustments are recommended.
Most manufacturers recommend tuning two to four times per year, which may prevent expensive piano repairs in the future. Depending on your piano's age, current condition, and amount of usage, Mr. Shoffner will recommend a maintenance schedule. After your first tuning, you will receive a regular maintenance reminder.