To maintain your piano properly, you need to have a qualified piano tuner/technician like myself to tune and service your piano at least twice a year. For new pianos, or newly restored pianos, tuning should be done 4 times a year for the first 2 years. After this initial period, you can resume having your piano tuned only twice a year.
For pianos that haven't been tuned or serviced in many years, a succession of 2 to 3 tunings will need to be performed 1 month apart from each other to get your instrument up to standard pitch, which we call A-440. When you have Don tune your piano, he not only adjusts the strings to the right tension, but also checks for any potential problems. This helps you avoid major repair work and saves you money.
Pianos are constructed mainly of wood, which expands in the summer from excess humidity and contracts in the winter from excess dryness.