Actually, you can run one of these with a passive evaporator. The thing resembles a solar thermal panel without the glass. Definitely not something mass produced commercially for dehumidifiers, but it can be done. The closest thing to what you seek is used in deep freezers and marine fridges and freezers in the capacity range you are operating. Lots of these units have no fans at all, and work reliably for decades. Number one cause of death: failed thermostat.
Don't underestimate the savings that these little projects can produce. The return on investment happens faster the more you run your machine. After that, It's money in the bank. Please make sure and let us know how much (or little) this project is costing (or saving) you during regular operation.