The relative air humidity is very strongly dependent on the temperature.
100% r.h. at 0°C corresponds to approx.
70% at 5°C,
50% at 10°C and
35% at 15°C.
For details see here
Unfortunately, I did not find a diagram with English lettering
(simply search for Mollier diagram or h-x diagram).
The diagram is a bit confusing at first glance.
If you want to know which humidity at a certain temperature corresponds to the value at another temperature, simply proceed as follows:
In the graph, find the intersection of the initial temperature (red line) and the initial humidity (blue line) and then go down or up along the vertical (gray) line to the desired target temperature. From this intersection, follow the blue line > target humidity.
This diagram also shows when air of a certain temperature and humidity condenses during cooling. Simply follow the grey line down to the intersection of the blue line for 100% humidity.
I would try to avoid a relative humidity above 70%. Good ventilation is usually sufficient.
Dehumidifying air is a fairly energy-intensive process. If you decide to dehumidify the air, you should make sure that the room to be dehumidified is well sealed - otherwise you dehumidify the ambient air