19 November 2014
This is in our sometimes humid porch which is 3 walls of windows and bare red brick. It needs to be charged maybe every 2-3 weeks or so but it has certainly significantly reduced the condensation on the windows in the colder weather. I ruined one by being silly and not paying attention to the instructions so microwaved it window side down. Nobody to blame but myself when it stuck to the plate and created a hole when I tried to take it off. The replacement works just as well as the original one.