I checked Google and found relevant and good answers. The base of knowledge is much broader, because you find information about wooden instruments in general, not only guitars.

If you want to take care of your instrument, have a hygrometer in the same room and watch it regularly. Humidity can drop below 30% in winter and this is not good for any wooden instrument. Constant change in humidity is also not good, so don't put your instrument too close to a heating source, don't let the sun directly hit it, keep temperature constant.

I played a high quality piano for quite some years - I learnt that humidity can have a huge influence on the tuning of a piano. So I started to keep it constant.

Cheers

David

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