dehumidifier

I have a 12x12 lung room with a 4x4 and a 4x8 tent in it what kind of dehumidifier should I get? I have 2 already but they don't keep up and often freeze up also thinking of putting a small one in the tent's but can't find one without lights on it what should I get?

One 70 pint should handle it all, they are freezing up because the room is to cool below 70 its common the warmer the room is the better they run.