While this cost about the same as a dyson with the Hepa filters, its pretty neat to see thenostr:npub1srsa6lqlxnqfg3lgmzjxrjtn77tlju7t77zy8t6t9ydlnkv7syts8dwhlh offsetting my heating costs by 33% already. No wasted energy in this house mate. Great and useful gadget!