Lovely video 10 : How Many Amps Does An Air Conditioner Use?

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in this video, I will be discussing How Many Amps Does An Air Conditioner Use?

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Summer can be a dreadful period when you don’t have an air conditioner. What could be more dreadful is purchasing one when it doesn’t match the energy input of your home.

So, it’s best to know the current requirement of an air conditioner before buying it.

A small air conditioner on a 120 volts circuit will need 7.5 amps. On the other hand, medium-sized air conditioners on the same circuit as above will run on about 15 amps. They will require a dedicated circuit rated 240 volts for larger ones and draw as high as 30 amps. The number of amperes used by an air conditioner is quite variable.

How Many Amperes Does A Central Air Conditioner Use?


The number of amps used by a Central Air Conditioner varies depending on the size and BTU rating. Amperes can go between 15 amps to about 60 amps of current.

Additionally, it operates on 208 to 240 volts. Because of this enormous amp and voltage needs, you shouldn’t plug in central air conditioners like you do portable and window air conditioners.

Instead, they are supposed to be hard-wired into the house. As stated earlier, the current in amps used by an air conditioner depends on several factors.

This includes the voltage, power, cooling capacity, and size. Most times, this is measured in British Thermal Units or simply BTU. The higher the BTU rating, the more amps it will require.

The amps rating of an air conditioner tells you how much current it draws. This is the amount of electricity that flows through it per time.

It’s essential to know the amp rating because, with the amp rating, you can see how the air conditioner consumes much electrical energy. This way, you can estimate the electrical energy cost.

If you need to know how many amps an air conditioner pulls, you can check the air conditioner’s label or the user manual. It is usually stated there.

If, however, it isn’t, you can derive it from two simple steps. Firstly, you need to know the capacity or BTU rating of the air conditioner.

You can get this by dividing the Energy-Efficiency Rating (EER) by the Power rating in Watts. The Energy-Efficiency rating is usually included in the specification ratings in the user manual.

However, it varies between 8 to 12 for between 5000 to 18000 BTUs for air conditioners. Next, to get the current in amps, you must multiply the BTU rating of the air conditioner by the voltage.

Then you divide the Energy-Efficiency Rating by the previous answer to get the current in amps. Most times, air conditioners up to 15000 BTU require 115 volts.

So if the voltage is not stipulated, and the BTU is not more than 15000, you can use 115 volts.

In buying air conditioners, I’ll advise you to always go for the ones with a more excellent Energy-Efficiency Rating because they consume less electricity.

Therefore, you’ll spend less money paying for electricity which means you can save up the extra cash for other expenses.

It would be best if you also looked at the size of the air conditioner compared to the space in your home.

Do not make the costly assumption that the higher the power, the more the cooling and thus the more energy is saved.

If you buy one much larger than your space, it will draw too many amps meaning more electric bills. You will spend more and gain less.


Oversized air conditioners do not operate sufficiently enough to extract all the humidity. Likewise, you should not purchase an air conditioner that’s too small for your space.

An air conditioner that’s too small will need to keep working continuously for most of the day to make your home cool. This also consumes a lot of amps and makes you spend more on electricity.

Thus, as a general rule, the size of the air conditioner must always be proportional to your room space. It should not be undersized or oversized.

You should also ensure that you don’t use an air conditioner with a higher amp rating than the circuit breakers in your home.

Once an air conditioner requires above 30 amps of current, you should ensure a dedicated 240 volts circuit breaker. Always contact an experienced electrician whenever the need arises.


If you would like to read a blog post about this topic, you can visit our website; a link is in the description.

If you have any feedback or question, please write down in the comment below.

Thanks for watching, have a good day.

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