How Much Power Does A Box Fan Use

For a common household, a box fan is a useful appliance to have around in the hot seasons, and especially with the climbing cost of electricity nowadays. In fact, not everyone can afford to have HVAC on for twenty-four hours a day and seven days a week.

As you know, a box fan can cater to most of your cooling need without the actual power gobbling characteristic of (a) full-fledged HVAC unit(s). In this article, I will guide you to calculate the energy cost of appliances. More detailed, it’s the box fan to understand how much power does a box fan use ? Read on!

How much power does a box fan use

Before we could go into that, a little exposition wouldn’t hurt. A box fan is a small, quite portable fan unit that is enclosed rigidly in its casing that can output quite a lot of power for its size.

Box fans have been used as an alternative, slower but more sustainable cooling system in houses for decades. And to calculate how much power it could eat up every hour you would need to do some simple math and deduction to get there.

A box fan is a small, quite portable fan unit

Image source: Wirecutter

First, what we need to obtain is the kW/h (Kilowatt per hour) a common box fan produces. This calculation varied from one model to another according to their specifications. But for this guide, we will calculate the average box fan and their output.

Now, a watt is a unit as part of the International System of Units (SI Unit). It is used to annotate how much electrical power a certain object required or consumed. A kilowatt is 1,000 Watts, and Kilowatt per hour is an indication of how many kilowatts the appliance would use in an hour time.

The wattage of the appliance or any appliances could be found right on the cover or within a label or at the bottom of the casing.

We need to convert that wattage needs to kilowatt to continue our calculation. And that’s by dividing that number that we had with 1,000. For example, if an appliance is 2,000 watts, by dividing it, we would know that it uses 2 kW/h. Or if it’s 500 watts, we would know immediately that it would consume 0.5 kW/h. Pretty easy, right?

A nominal box fan operates at roughly 50-100 watts. Thus, on average, it would be 75 watts for a box fan. So that, after division, would be 0.075 kW/h.

The operating cost

Now that we know how much power a box fan uses in an hour. It’s time to cater to the actual cost of operating them. Depends on your country, the electric price could be different drastically. However, in the U.S., it costs roughly 10 cents for a kWh.

We can use the data by multiplying 0.075 kW/h with 10 cents. And we have a rough calculation of 0.75 cents per hour. A month has about 730 hours, by multiplying it up further. From that point, we would have an operating cost of only about 5.5 dollars per month if you run it continuously all the time.

In comparison to almost $110 to run an HVAC system, this is insanely cheap. It is, in fact, 22 times cheaper just to run a box fan.

That said, although a box fan is considerably cheaper and the more economical option to use, it is less effective than an HVAC unit. It can cool less, and it needs longer to cool a large room. For some people, that’s not quite acceptable even with the cheap cost.

The way to compensate is to use the HVAC to cool the room up to a pleasant temperature. And it’s also to use the box fan to stabilize this temperature instead to have the best of both worlds.

Or you could invest in several fans at the same time, and you would benefit greatly from it.

The operating cost

Image source: Interior Bathroom Bedroom Living Room Decor


Cooling and heating are one of the most power intensive systems in your house. And if you found yourself having a gigantic rocket in your bill, that, most of the time, would be because you have used too much of them.

So if you don’t have a lot of economic margins to spare, choosing box fan, or several box fans, is the best way to success while still having a cool room on a scorching hot day.

Now that you’ve known how much power does a box fan use, you could detail out your plan even more!

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