Always try to locate a piano in a room with constant temperature and humidity. Avoid standing the piano close to frequently open doors and windows causing drafts, to heaters and fireplaces, to the steam from kitchens and bathrooms, and direct exposure to the sun.
Temperature and humidity control
Although this cannot always be accomplished easily, Try to maintain the required levels for temperature and humidity. Keeping a piano covered when not in use and equip it with a humidity control device, will contribute very much to piano tuning stability.
Frequent piano tuning assures the player of hearing proper harmonious sounds. The more often a piano tuning is performed, the smaller are the adjustments that need to be made by the piano tuner during every piano tuning. The smaller the adjustments made the more stable the piano tuning will be. The more stable the tuning, the longer it will last.