We had this in our cabin a few weeks ago. At first it wasn't on constantly, but we called maintenance a couple of days in because the HVAC unit was making a pretty loud rattling metal-on-metal type of sound. It took them an hour and several full unit power on/off switches, but finally got the sound fixed.
From then on I noticed the dehumidifier ran constantly the rest of the trip. It didn't bother us during the day, but at night I did find the noise a little bothersome, but was able to sleep through it. On the plus side, our towels were always nice and dry. On the downside, the weather was cool and air already dry - I would have loved to known the actual humidity in our unit because it certainly felt really low - like how cold, dry air makes your skin and nose feel after awhile.
FYI, I used the app chat feature to contact maintenance, it's pretty easy. You can also use the phone in your room to call, which puts you to a central call center (no matter what they say) but the information gets relayed to people at the Fort that can help.