Product review (5 stars): It works! Dropped the temperature in the laundry room about ten degrees
Outside heat here in South Florida was leaking into the laundry room (and don't even get me started on the insects) through the old simple metal flap vent that came with the house. Our laundry room is on the south wall and takes a lot of heat. The temperature in that room more closely tracked the outside temperature than the inside and in summer, the outdoor temperatures can still linger in the eighties at night. Replaced it with the Heartland 21000 Dryer Vent and the effect was immediate: when it is in the nineties outside and the thermostat inside is set at 78', that room now stays at 78', just like the rest of the house. Sturdy, well built, easy to install, and no decline in drying performance. Highly recommended.