The furnace kicks on. The air gets drier. And somewhere in your living room, your piano starts to change.
You might not hear it right away. But by the holidays, a lot of pianos sound noticeably different than they did in summer.
Here's why — and what to do about it.
According to the Piano Technicians Guild (PTG), seasonal and even daily changes in humidity make a piano's wood parts swell and shrink. That affects tuning stability and how the keys feel.
The part that reacts first is the soundboard — a sheet of wood roughly 3/8 of an inch thick, built with a slight upward crown.
When the air gets dry, the soundboard shrinks, the crown flattens, and the strings lose tension. The pitch drops — most noticeably in the middle of the keyboard.
When humidity rises again, the pitch rises with it. That back-and-forth is why a piano only stays in tune as long as the humidity around it stays steady.
PTG notes that extreme humidity swings can eventually crack wood and weaken glue joints.
The felt and leather in the action change size too, which can make the touch feel stiffer or less even. And very high humidity can lead to rust on strings and tuning pins.
1. Check where your piano sits. Keep it away from heating and cooling vents, stoves, doors and windows. Direct sunlight is especially damaging. If your home isn't well insulated, an interior wall is better than an outside wall.
2. Get a hygrometer. An inexpensive wall hygrometer tells you your room's relative humidity. You can't manage what you don't measure.
3. Use a room humidifier — carefully. A humidifier during dry months helps. Just don't overdo it: PTG warns that too much moisture in winter can cause condensation on windows and other cold surfaces.
4. Consider an in-piano humidity control system. These systems combine a humidifier, a dehumidifier and a humidistat, and are designed to keep the air inside the piano at 42% relative humidity. They're installed out of sight by a piano technician.
5. Schedule your tuning. Steadier humidity means your technician doesn't have to make big pitch corrections before fine tuning — so the tuning holds better.
Every region is different. PTG points out that in most areas humidity is low in winter and high in summer, while in some places the cycle is reversed.
In Michigan, furnace season usually means very dry indoor air. In the Pacific Northwest, damp weather outside and heating inside can pull readings in different directions.
That's exactly why a hygrometer matters — your house has its own climate.
Michigan winters are tough on pianos. Whether you need advice on humidity control, a pre-winter check, or expert piano restoration, The Piano Place is here to help. Call (248) 619-9027 or contact us.
Sources (fact-check only):
Piano Technicians Guild — Humidity Control: ptg.org/teacher-resources/caring-for-a-piano/humidity-control (soundboard 3/8", pitch drop/rise, 42% RH, placement, hygrometer, condensation warning, in-piano systems, A440)
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