I bought one off ebay for the observatory, with the advantage of it being a 12V unit with an AC adaptor, i thought that gave me options for battery power. It could pull a litre of water out of the air in a couple of hours. The problem was it was not designed for long run times and eventually the power connector melted. Its rubbish now. So be careful with purchasing to ensure the 'duty cycle' is up to the job. Any of the pure AC ones might be fine. For a room inside the house, my scope room, i use those dehumidifier canisters that can be refilled.
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