Double pane energy-efficient

Dear Diary, Last year I replaced all the windows in my house with those expensive double pane energy-efficient kind. Then, this week I got a call from the contractor who installed them. He was complaining that the work had been completed a whole year ago and I still hadn't paid for them. Now just because I'm blonde doesn't mean that I am automatically stupid. So, I told him just what his fast talking Sales guy had told me last year.... Namely, that in ONE YEAR these windows would pay for themselves! Helllooooo? It's been a year! There was only silence at the other end of the line, so I finally Just hung up. He didn't call back. Bet he felt dumb!