Originally Posted by amirie
t said something about keeping the temperature just above the "dew point"
The warmer air is, the more moisture it can hold. The dew point is the combination of the air's water content and temperature at which the air cannot hold any more moisture, so any chilling (such as by touching a colder surface) will cause water to condense out as dew.
Slightly warming air without changing the moisture content allows it to hold the moisture, so it doesn't come out as condensation.
Do the cheap heating "dryers" contain a humidity sensor? Seems unlikely, and in some conditions they wouldn't have nearly enough heat output.
Originally Posted by cpaharley2008
Actually most dehumidifiers and air conditioners create heat as a byproduct of their operation.
Yes, but in this case heat is not a byproduct of the appliance's operation - it is the only
effect. There isn't a refrigerant circuit, compressor, condenser, and evaporator in there.