The basic Glade Plug-in uses 2.1 watts of energy. The fancier ones with nightlights and light shows use over 3.5w.Click to see full answer. Regarding this, how much power does a plug in air freshener use? 4 watts One may also ask, how long do glade plugins last on highest setting? Continuous fragrance for any size room is just an outlet away. Each fragrance refill lasts up to 30 days, depending on the setting you choose. Simply plug in the warmer for long-lasting fragrance thats adjustable to fill any room in your home with your favorite Glade fragrances. Also Know, is it safe to use plug in air fresheners? It is extremely dangerous for babies as it can cause diarrhea in them if used everyday. If it is used once or twice in a week, it does not cause much harm to the little ones. Studies have proved that these air fresheners are air pollutants more than air fresheners. They release toxic pollutants in the air continuously.Which appliances use most electricity? Here are the 10 Household Items that Uses The Most Electricity In Your Home Water Heater. Washer and Dryer. Lights. Refrigerator. Electric Oven. Dishwasher. Computer. TV.