Product review (5 stars): Worked like it was described and survived a tough tough winter...
Bought this to keep the fridge in my garage running appropriately through winter after experiencing thaw when the temps outside were so bitterly low.  I was amazed at how easy it was to install and frankly fixed the issue I was having immediately.  Have had it for over two winter seasons now (last winter was the worst in 20+ years) and the fridge is still working great!  Definitely recommend...