That model is about what we have. It works well, and you likely won't have to run it continuously. It'll pull some power; any compressor does.
If your walls are sweaty, though, you need to do something, and that will not pull as much power as your AC. It will heat the basement up a good deal, though, so consider that -- are you easily cool enough in the house, or will the added heat mean you run the AC anyway?