The vacuum takes the title of most efficient in #EnergyFaceoff round two. | Graphic courtesy of Stacy Buchanan, National Renewable Energy Laboratory
If you're a regular user of hair dryers and vacuum cleaners, you likely spend similar amounts of time each week using these noisy appliances. While a hair dryer might be used for a few minutes each day, you probably use the vacuum for one or two longer stretches. But how do the costs shake out over the year?
Vacuum: 297 W
(297 x 1)/1000 = .297 kWh per week (weekly consumption)
.297 kWh/week x 52 weeks = 15.44 kWh (annual energy consumption)
15.44 kWh x $0.11/kWh = $1.70 per year
Hair dryer: 710 W
(710 x 1)/1000 = .710 kWh per week (weekly consumption)
.710 kWh/week x 52 weeks = 36.92 kWh (annual energy consumption)
36.92 kWh x $0.11 = $4.06 per year
Assuming similar time spent using both, you may be surprised to learn that the little hand-held hair dryer costs more to operate than the much larger upright vacuum cleaner. While neither will break the bank, and this isn't a matter of deciding which to use, it is a good example of how we might wrongly assume one product is more efficient than another.
Did you guess right on this #EnergyFaceoff matchup?