Of course there are. A bit of Pallet wrap, repurpose some raised floors with refrigerated airflow and butthead Bob's your frosty uncle. ![Evil >:D](https://www.eevblog.com/forum/Smileys/default/evil.gif)
What people who propose these things usually don't realise is the way people decompose. This happens, albeit at lower rate, also when chilled. Turning the humidifier off in the HVAC plant will of course stall and reform the decomposition somewhat, but usually not enough to create a large difference.
We usually end up as soggy messes, if we're not actively dried-out. Pallet wrap is but a stop-gap measure.
Freezing would of course pause the process, but I know of no computer room cooler in existence that would actually manage to freeze something, except itself where inconvenient; i.e. "icing up". There is, you see, one set of people more optimistic than agile project managers, namely HVAC designers. There is no so constantly underdelivering field of modern engineering. Too little, too warm, in the wrong spot, and leaking (mighta been condensate from piping not insulated well enough, though). That about sums it up.