A typical plug-in air freshener uses about 2 to 3 watts of electricity, running continuously 24 hours a day. That works out to roughly $3 to $4 per year at average U.S. electricity rates. The power draw is tiny compared to most household appliances, but it’s constant, and the real cost of running these devices has more to do with refill cartridges than your electric bill.
How Much Power They Actually Draw
Most plug-in air fresheners from brands like Glade and Air Wick use around 2.2 watts. That’s less than a single LED nightlight. The devices work by using a small ceramic heating element to warm fragrance oil, which causes it to evaporate into the air. There are no fans, no motors, and no moving parts in most models. The heater runs at a low, steady wattage whenever the unit is plugged in.
Because the heating element is always on, the power draw doesn’t fluctuate much. Whether the refill cartridge is full, half-empty, or completely depleted, the unit pulls essentially the same amount of electricity. This is worth knowing: an empty plug-in sitting in your wall outlet is still using power for no benefit.
Monthly and Yearly Electricity Cost
At 2.2 watts running around the clock, a single plug-in air freshener consumes about 19.3 kilowatt-hours per year. Using the current U.S. average residential electricity rate of 17.24 cents per kWh (as of late 2025, per the Energy Information Administration), that comes to about $3.33 per year, or roughly 28 cents per month.
If you have three plug-ins scattered around your home, you’re looking at about $10 per year in electricity. For comparison, a single 60-watt equivalent LED bulb left on 24/7 would cost around $9 per year on its own. Plug-in air fresheners are genuinely low-power devices.
Where the Real Cost Adds Up
The electricity is almost negligible. The expense that actually matters is refills. A typical scented oil refill lasts 30 to 45 days and costs $3 to $6 depending on the brand and where you buy it. That means you’re spending $25 to $70 per year on refills for a single unit. The fragrance oil costs 8 to 20 times more than the electricity to heat it.
One practical way to cut costs is plugging the unit into a basic outlet timer. Setting it to run only during the hours you’re home and awake (say, 12 hours instead of 24) cuts both the electricity use and the refill consumption roughly in half. The refill lasts twice as long, which is the meaningful savings. You’ll barely notice a difference on your electric bill either way, but stretching a $5 refill from six weeks to three months adds up over a year.
How They Compare to Other Small Appliances
- Plug-in air freshener: 2 to 3 watts
- Phone charger (idle): 0.1 to 0.5 watts
- LED nightlight: 0.5 to 3 watts
- Wi-Fi router: 5 to 15 watts
- Cable box on standby: 15 to 30 watts
Plug-in air fresheners sit in the same power neighborhood as nightlights. In fact, many models include a small built-in light, and they’re tested under the same safety standard (UL 1786) that applies to direct plug-in nightlights. The heating element stays cool enough on the outside to avoid fire risk under normal use, though you should still avoid covering the unit or letting curtains drape over it.
Tips to Minimize Waste
Unplug units when the refill runs out. Since the heater draws power whether or not there’s oil to warm, a forgotten empty plug-in is pure waste. It’s only pennies, but it’s also pointless heat being generated in your wall outlet for nothing.
If you run multiple units, consider whether you actually need scent in every room at all times. A single plug-in in a main living area, set on a timer for your waking hours, delivers most of the benefit at a fraction of the refill cost. The electricity savings are minimal in dollar terms, but reducing refill purchases from eight per year to three or four saves $15 to $30 easily.