Product review (5 stars): Great tool to save on electricity.
Installs in 15 minutes...not necessarily easy because of the ducting issues behind the dryer.  The dryer needs to be carefully  pulled out so as to not pull apart the ducting.  All in all a great idea, although somewhat of a kluge effect. It does work well, but be advised you need a fan in the utility room in order of move the air out of the confined space.  A larger room would not need this help.