Not a real easy question to answer. The 30 to 40 range would be great if you can get to that point. If you air condition and live in high humidity high temperature climate that will be tough.
Do a few Internet searches on relative humidity and then you will be able to understand the problems and you might be able to figure out what to do on your own.
You need to understand the direction of vapor movement and where your vapor barrier is to avoid condensation in the wall cavities. So in the north we have a vapor barrier on the inside (warm side of the wall) for winter, in the south vapor barriers are often on the outside of the wall if you air condition most of the time.
Thus if you live in the north and de humidify to 40% in the summer with a relative humidity of say 80% exterior, air moving through your building envelope may condensate in your wall cavity because now the vapor barrier is on the wrong side of the wall.
It's a very complicated issue, in the end game health rules, so try and keep your living environment to as low as you can for humidity.
This is the issue I have, live in the north with winter temps to -20 and summer temps to 90 with RH of 90 %. No easy solutions.
Sorry for the long post, I am sure I did not help!
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