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in a water-tight house, with the heating on when frosty outside, you should be getting RH below 35%
So I'd wonder if you have a bit of damp getting in to the house
I must have a very humid lifestyle....
I just opened the window and it went from 70% to 64%. Edit - now it's at 60%. Wtf.
I'll leave it a bit and place it at the other side of the room.
My YouTube Channel
My YouTube Channel
My YouTube Channel
RH in a UK house is typically based on what it is outside, plus the effects of central heating (CH) and living (breathing, cooking, washing, etc). In the UK, we almost always want to increase indoor temp above outdoor temp, or throw open all the windows. Few use air con to chill the air.
Roughly, raising air temp by 20C doubles the water it can hold, so if it's 50% RH outside, at 5C, and you take that air and heat it to 25C, it will be 25% RH
In real terms this means that in the summer, with the windows open, RH will be similar to outside, usually 45-55%. It rarely goes past 60% in the UK. In Florida or Japan it is a different story
In the UK in the winter, with the heating on, RH indoors is usually 32%-35%, rarely more than 30%
On cold dry days, outdoors air is very cold and dry already, heat that air and get it indoors, and even with breathing and cooking, UK indoors RH can be 27% or less on a snowy day. Offices and hotels are very bad for this
In the spring an autumn, indoors air is often 35% or 37% in houses I've lived in
Air con dries the air in the reverse way: it cools air, and the water falls out of it, then adds the air back to the room.
Heavily airconditioned rooms can get too dry for guitars in the summer. More advanced air con adds moisture back into the air separately.
Our double bass player has the opposite problem; his (circa 1860) bass dries out in winter so he has to put a wet rubber sausage thingy in his F hole(!). He likes to keep his house humid. I wouldn't lend him a paperback book.
Humidity in the house north of 55% the whole time. No way I'd be able to properly look after my good acoustics without a dehumidifier and very good cases, which the guitars live in when I'm not playing them. I use these to ensure the cases are providing suitable protection: http://www.planetwaves.com/pwhumiditrak.page?sid=8b8529dc-67ad-427b-b73d-6834da5391a1
My YouTube Channel
http://www.appliancesdirect.co.uk/p/cd20le/electriq-cd20le-dehumidifier?refsource=Apadwords&gclid=CM-ExOHitNECFYwy0wodgj8Irg
I'm getting a loan of one off a guy at work for a week so will see how it does. No point spending thousands on guitars and skimping on something like a dehumidifier!
My YouTube Channel
My YouTube Channel
if it is, I'd be looking for leaks first (pipes or rain getting in)
I use the cheapy room dehumidifiers that collect moisture and just move my acoustic into another room anytime there's washing drying in that room.
My house isn't a leaking pile of damp either ... I just happen to gravitate towards putting on a jumper rather than running the CH all year.