A house that is allowed to get very hot will generally tend to become dry or have a low relative humidity a house that is allowed to get very cold usually tends to become damp or have a high relative humidity. Temperature fluctuations in and of themselves are not generally problematic, but they do tend to cause humidity variations, so that's why it's wise to be aware of both. Hence humidity fluctuations that are severe or rapid can cause wood to crack or split over time. However, also like a sponge, wood has a limited flexibility that also diminishes with age. When humidity is low, wood shrinks or contracts. When the humidity is high, wood swells or expands. Wood is somewhat like a sponge in its reaction to moisture. The reason you want to try and minimize the piano's exposure to humidity fluctuations is because it is made of wood. However, in real life it is nearly impossible to meet all these conditions. Translated, this means: Position your piano as far as possible from air conditioning and heating vents, wood burning stoves, radiators, fireplaces, uninsulated outside walls, damp cellars or basements, windows with direct sunlight, windows without shades or drapes, doors or entrances to the outside, heating or cooling appliances, or aquariums or other sources of water such as showers or swimming pools. Ideally, the best location for a piano, climate-wise, is away from any source of sudden or extreme temperature or humidity change. There are a number of factors involved here.
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