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I ran a TECO dehumidifier in my scope room for a couple of years. I plumbed a drain hose through the outside wall. It meant that I didn't have to worry about emptying the built-in tank a couple of times a day. Here in Darwin in the wet season, the 5 litre tank filled in about 12 hours.
It works essentially as a reverse air conditioner. In order to extract the moisture from the air, it expels hot air. So to keep the room at 40% humidity, the room temperature would be about 33 degrees. If I spend time in this room (it doubles as my study/workroom), then I also run the room AC to keep the temp down a bit.
I ran it 24/7 during the wet. Unfortunately the fan motor died. When I contacted TECO I was told that they didn't keep spare parts as they considered these units not economical to repair.
I now have a DeLonghi DDS25 which will go down to 30%, and works beautifully.
They do add a bit to your power bill, but with expensive Astro and photo gear I reckon it's worth it.
I would recommend buying a model which will accept an external drain pipe. Easy to fit but you must keep the pipe lower than the drain exit of the machine.
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