DIY Electric clothes dryer energy recovery for those colder months [View all]
http://georgesworkshop.blogspot.ca/2014/06/clothes-dryer-heat-recovery.html
This easily built project recovers warm moist air from a clothes dryer that would otherwise be exhausted to the sub-zero outside.
Energy is saved two ways: heat used to dry clothes remains in the house and less cold air is drawn in by preventing negative pressure. Electrical energy that is used to dry clothes contributes to house warming. Moisture that is added to the house air is welcome during a northern winter when the cold temperature outside causes the air in the house to become very dry.
I only use this in winter. In the summer, I re-route the vent to the outside but I use the clothes dryer only on rainy days. I use the outdoor clothes line whenever possible. I also have a indoor clothes line which is used on damp days and even in the winter.
My clothes dryer is used as little as possible as it uses an enormous amount of electrical energy. The nameplate on mine lists 25 amps at 240 volts or (25x240=) 6000 watts. When I do use it, it is good to know that the expensive heat is used twice by not being blown outside.