Product review (4 stars): Energy saver- Could be constructed better
I will start by saying I live in Arizona.  Even then, it gets pretty cold in the winter.  Our winters also tend to be fairly dry, ESPECIALLY when using artificial heat in the house.  This vent does two things.  First, it adds heat to the house.  Second, it adds much needed moisture to the air.  When doing several loads of laundry the warmth and moisture is noticeable and much appreciated.  My only complaint is the actual construction of the unit leaves something to be desired.  The plastic has gaps and the air deflector does not fit as tight as I would like.  I do appreciate being able to capture the warm, moist air that might otherwise be lost outside in the winter.  Overall a good (but not great) product.  Would I buy it again?  If I couldn't find something built better, yes.