Will using a dehumidifier warm the air and reduce the cold damp feeling in winter?

Gerry1

prowla said:

I think that humidity tends to decrease with temperature.

Nope.  If the air warms up it can hold more moisture so the humidity falls.  As the temperature falls the humidity will rise.  That's why you'll see condensation on your car when the air gets chilly.

 

Qyburn

Scot_39 said:

Its inherently more difficult to think of energy being created in a "closed" system.  But then the room isn't fully closed - it loses or gains heat from other sources - through walls / windows etc.

Energy isn't being created. It's a conversion from latent heat to "sensible heat". The opposite of the cooling you'd feel as water evaporates off a wet surface.