Product review (3 stars): Make sure you have the air leak problem this closure is designed to solve (at a cost)
I bought and returned this product.  I didn't have a noticeable air leak issue with my laundry room, and I couldn't even feel cool air inside the dryer after it sat unused for days during the winter in Colorado.  Still, I was working on the dryer and I thought that the more air sealing of my house I could do, the better.  After I watched a video titled "How to reduce your clothes drying time and save energy costs," I decided to return it.  The improvement in air sealing this closure apparently provides does not seem worth the measurable increase in back pressure this closure causes.  So, I doubt I'd see a NET savings in energy.  If the inside of my dryer was cold in the winter, I might feel different.