Thanks for your all you replies. A heater is impractical for this application, but that is definitely a consideration for enclosures with more space.
I think that there is a consensus here that some sort of air exchange is necessary. Makes me feel better about my thoughts here, especially the...
I am not very knowledgable on condensation and vapor pressure topics so hopefully someone can help.
We have an aluminum j-box mounted outdoors with a circuit board inside of it. It is in a seal-tite 1/2" conduit system. I am a bit concerned about condensation forming inside and am considering...