Something else to keep in mind is that stated power consumption is not always equal to actual power consumption. Many products will list power consumption at full load, which is almost never reached. I'm not an expert on air purifiers, but I would expect your actual power consumption to be less than listed. Also, some devices cycle themselves through states where they may be fully on for a while, then in idle state for a while. I guess what this really boils down to is this: you have an air purifier, you obviously thought it was important enough to pay to purchase it, now you need to pay to use it. Either you want it, or you don't. Is that harsh? I don't mean for it to be. Rick.