Copper motors can also help reduce energy loss by generating less heat. For example, the Bionaire ISF004 Desk Fan has a DC motor that uses 63% less energy than a traditional fan. DC motorįans that have a DC motor rather than AC will be more energy efficient. If you're shopping for the best fans to save energy, look out for these useful features that make a model as energy efficient as possible. (Image credit: Ti-Media) What energy saving features should I look for when buying a fan? An example tower fan that uses 35 watts or 0.035 kWh is even cheaper to run at 1p an hour and over 10 hours, just 11p.Compared to an example bladeless fan, which uses 56 watts or 0.056 kWh, its cost per hour is just under 2p.So if you're paying 34p for energy, it’d cost 3.4p an hour to run. An example 18-inch bladed floor fan uses up to 110 watts at full speed, which is 0.1 kWh.Multiply the cost of a unit of energy by the kW output of your fan and that will be how much it is costing to run your fan. According to the Energy Saving Trust (opens in new tab) the national average price (as of October 2022) per pence/kWh of electricity is 34p. This should be listed on your energy bill. To work out the cost, you will need to know how much you pay for one unit of energy (1kw). This is how much energy the fan uses in a day. If you are using it for ten hours a day, you'll then multiply 0.05 by 10 giving you 0.5kW. For example, if you have a 50-watt fan, you would divide 50 by 1,000 to get 0.05. Mini models can use as little as 5 watts, while large bladed fans can be more than 100 watts.
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