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Dehumidifiers work well in travel trailers, the room-temperature humid air enters the dehumidifier, where it’s then cooled to its dew point, which results in its releasing its moisture, which goes into the water tank. The dried air is then heated by the combination of latent heat of condensation, which is a natural result of the process, and by circulating through the condenser where heat is exchanged from it to the air. There’s also some additional heat generated by the dehumidifier’s air compressor. The overall result is that the air going back into the room might be warmer than it was going in, usually around 10 to 15 degrees so you will gain some heat. The downside is that if your paying for electricity they cost about the same to run as a full size refrigerator. Opening vents works fairly well if the vent has an exhaust fan, they do expel warm air but if your using a trailer or motor home in cold weather your likely going to have to do something to deal with humid air. I like to use an electric heater if I don't need a lot of heat but the air exchange you get from running a furnace is not there so moisture build up is more of a problem. If your moisture problem is not too severe there are small low cost dehumidifiers designed for smaller rooms or spaces that are economical to run.
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