CDRLabs.com

For storing HDDs, DVDs and electronics, is it less harmful to have a high temperature of 34-36C and a slightly lower humidity of 57-65% or a lower temperature of 32-33C and a slightly higher humidity of 65-70%?
If I turn on the dehumidifier in my room, the humidity goes down a little and the temperature goes up

I'm going to say that for electronics and hard drives, having a lower humidity is more important than temperature. You really don't want water in there, creating corrosion or shorting something out.