Don't let extreme weather conditions or humidity prevent you from having a piano that works for a lifetime. Instead, position the instrument away from windows, outside doors, heating and air conditioning vents, fireplaces or wood burning stoves, and other sources of extreme or sudden humidity or temperature changes. Try to maintain the relative humidity in a range of 35–50%.
Use a central air conditioning unit during the humid summer months and add a humidifier to your central heating system to reduce the extremes of high and low humidity. This piano maintenance step also improves tuning, touch, and tonal stability.
Room humidifiers and dehumidifiers are a perfect solution for piano maintenance when you don't have access to a central unit.