What is the ideal humidity for electronics?

Answer 1

The `ideal' humidity would be very low, simply because humidity lends itself to corrosion of the circuit boards and connectors. When humidity reaches a higher level, items such as rusting of any of the steel components, corrosion of the circuit boards and connections tend to deteriorate.

So unless you're in a sealed chamber where humidity can be controlled, you might want to consider things like room dehumidifiers or even central air conditioning in the summer to help control the humidity levels. In the winter months, humidity tens to be less in the colder climates and that's part of the reason that humidifiers are installed on furnace systems among other things. Humidity control is more for `creature comfort' than anything else.

But this leads to another problem, which is static electricity when the humidity is too low.That too, can be bad for circuit boards because a static discharge can reach potentials of several thousand volts.

According to CompTIA A+, a safe humidity is between 50 and 80 percent.