Product review (5 stars): Wanna save some money in the winter?
Well if you have an electric dryer, this is the best way!  In the winter you just turn the valve to shut off the hotair's route to the outside, yet to turn that hotair into your house.

It works, it really does and it provides a "wet" heat that smells like fresh linen (go figure, right?) instead of that "dry" heat that dries you out.

Well worth the money for the sweet smelling "wet" heat that it adds to your home.