 Last time I used it was last year. The power went out, and I hooked it up to a generator and put it in the window, and it cooled and worked just perfect. After the power came back on, I took it out of the window and put it in the storage container, and it's been there ever since. But it's a 5,000 BTU unit. It's an older unit, but it worked fine the last time I used it. If somebody needs it, I'll take $50 for it. They can call me at 264-