Because your piano contains materials such as wood and felt, it is subject to change with climatic conditions. Extreme swings from hot to cold or dry to wet cause its materials to swell and contract, affecting tone, pitch, and action response or touch. You can reduce the severity of these effects by placing your piano near a wall away from windows or doors that are opened frequently. Avoid heating and air conditioning vents, fireplaces and areas which receive direct sunlight. Your piano will perform best under consistent conditions neither too wet nor dry, optimally at a temperature of 68 degrees F and 42 percent relative humidity.

  While pianos generally fall into vertical and grand model categories, each manufacturer selects its own materials and utilizes its own unique scale and furniture designs. Every piano requires a different level of maintenance, depending upon the quality of materials used and the design and level of craftsmanship. Manufacturers can provide general advice on tuning frequency but your technician can give specific recommendations based upon your usage and locale.          (Source: Piano Technicians Guild)

  While my regular customers will service their pianos anytime between every month (commercial applications, such as colleges and churches) to 12 months, I personally recommend the piano to be serviced regularly every 6 to 12 months for the average home piano.