Product review (5 stars): Keep Your Heat -- OR Keep Cool.  Either way!
The Heat Keeper with its handy damper makes it so easy to direct that warm, moist air from your Electric clothes dryer INTO your home when it's cold outside.  Also, it's so easy to flip the flap to send it outside in the summer.  Imagine how much of that expensive, moist air could be saved, recycled, and reused during cold winter months!  Why isn't the government on this?