I had an older model dehumidifier given to me by parents that I used intermittently. I knew it was not the most efficient but assumed it would be okay since only used it a couple times a week. Within a few days of turning it on Sense identified it and showed me how wrong I was. That little dehumidifier, for my basement, was the biggest energy hog running, by far! By replacing it with a more efficient model, the energy savings will pay for it in a matter of a few months.