Dry air makes you sick.  Dry air destroys guitars.  Using a cool mist humidifier in the Winter to help things along is not enough because you must also know precisely how much water you’re putting into the air.  Guitars like a humidity level between 40-60%.  Anything below that threshold, and frets will eventually start popping out of the fingerboard.  Anything above 60% humidity and your guitar can start to swell in the exposed wood parts and not want stay in tune. The Honeywell TM005X Wireless Indoor/Outdoor Thermo-Hygrometer is an almost perfect device for home use that will wirelessly, and
remotely monitor, both the temperature and the humidity levels in at two
areas.  You can purchase two extra remote sensors to give you readings
in four places.  There’s only one major problem with this Honeywell
system.

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