I finally sprung for a small mechanical dehumidifier last week, (Hogarlabs PD14AS 2000 sq ft, 25 pint). Someone had a new unit on eBay for $88, well below what I have seen elsewhere, so I anted up.
The unit has several operating modes:
- Setpoint Control (enter the target humidity and it will cycle on and off at the preselected speed)
- Continuous (enter hi or lo fan speed and it will run continuously)
- Drying (it will run continuously on hi speed).
Apparently it will automatically cycle off at about 41 degrees f, but I have not been able to test that yet as the minimum temperatures have been a bit above that. It will also resume operation at the selected settings after a power outage, which I did test.
I've been running it in the trailer for six days here as the pineapple express has set new rainfall records here in the northwest.
It's manufactured in a land far away and the documentation provided in a little booklet is actually not too terrible, though it fails to include the nameplate specifications. I put it on an inexpensive watt meter today which measured 119 watts as compared to the 128 watts noted on the nameplate. I don't know how accurate the meter is but that was a satisfactory match for the time being.
I've been monitoring the humidity in the trailer with an Aqara bluetooth temperature and humidity sensor tied into a hub which reports to my phone via the internet; these are modern times indeed. The sensor and the dehumidifier are in "broad general agreement", with the sensor being located on the countertop beside the dehumidifier.
I started off running on setpoint control and it appeared to cycle frequently. I then set it to run in Drying mode over the past couple of days and the humidity quit cycling up and down.
I've been quite impressed as the humidity in the trailer has dropped from 68% to 48%, knowing that the process is much slower in our current cool temperatures, and that it's had to pull water not just from the air but also the various materials in the trailer such as the cushions, paneling, etc. I'm also liking the very low power consumption.