Hi Jerry,
I use a 12U rack equipped with temperature-controlled fans. With this setup, dew and humidity have never been an issue, in fact, even with considerable computing power and accessories running, the maximum internal humidity I measured last year was 60%.
The primary challenge is cooling. Without active airflow, the equipment does get quite warm. During my testing through whole summer this year, running passively without fans, the rack reached temperatures that, while not immediately harmful, would likely shorten equipment lifespan over time (e.g., a PC running at 90°C for extended periods). Adding fans makes a significant difference and is highly recommended.
Overall, a rack makes the space far more organized and gives you greater control over your equipment environment. From my perspective as a system administrator, I would strongly recommend installing one in an observatory, it not only improves functionality but also adds a professional touch.
Here is a graphic showcase of my rack, there are still modifications that will be done with different gear that I am currently implementing and testing but this is what has been powering my remote observatory for the last 6 months.
📷 image.png
Clear skies,
Luka