Should I use a dehumidifier in my library?

Copilot says:


Great question! The short answer is: it depends on the humidity level in the library.
Old books are very sensitive to environmental conditions. Here are the key considerations:
? Ideal Conditions for Old Books

Relative Humidity (RH): Typically between 30% and 50%. Too low can cause paper to become brittle; too high can lead to mold growth.
Temperature: Around 65–70°F (18–21°C) is recommended for preservation.

? Risks of Using a Humidifier

If the library is already within the ideal humidity range, adding a humidifier could push it too high, creating a risk of mold, mildew, and warping.
Humidifiers without proper monitoring can cause fluctuations, which are harmful to books.

? Best Practice

Monitor first: Use a hygrometer to measure current humidity.
If humidity is consistently below 30%, a humidifier can help—but ideally, use a humidification system designed for archives, not a standard home humidifier.
Avoid placing the humidifier near the books; distribute moisture evenly.

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I've a collection of old books.

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Nobody talks like this...

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Nobody talks like this...

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Maybe his library is full of books written in old English?

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Nobody talks like this...

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I do.

I’m somebody.

Nope. Nobody talkf like thif.

i have one for my guitar but most days with the a/c running the humidity in the house is right in the sweet zone. only ever run it when the a/c is off for a while and the humidity begins to climb

It depends on the humidity. As a general rule in the south, humidity levels are highest in the summer. The air can be damp. You might need a dehumidifier then. Humidity levels are lowest in the winter. The air can be dry. You might need a humidifier then. Get a hygrometer and keep track of your relative humidity %.