Updated at: 07-10-2022 - By: Sienna Lewis

When you don’t have air conditioning, summers might be unbearable. You don’t want to buy one if it doesn’t fit your home’s energy use. As a result, before making a purchase, make sure to check the present cooling needs in your home.

A 120 volt circuit will need 7.5 amps to power a modest air conditioner. Smaller air conditioners, on the other hand, use roughly 15 amps on the same circuit as the ones above. For larger ones, they’ll need a separate 240-volt circuit and draw up to 30 amps. The amperage consumption of an air conditioner varies widely.

What are amps in home appliances, such as window AC units?

There are several variables that come into play when it comes to evaluating how many amps a window air conditioner could utilize. Amperes, abbreviated as “amps,” are units of electrical power. Electric current is measured in amperes, which are units of electricity. An electric current is the number of electrons that will flow across the route of an electric charge.

Amperes are denoted by a “A” in your electrical gadgets, therefore you should be familiar with it. This will be referred to as the currency’s amps of power.

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It is necessary to use an ammeter in order to measure amperage. An electrical appliance’s power consumption will be influenced by the number of amps it has. One ampere is equal to one volt via one ohm of resistance, or one ampere per volt.

How Many Amperes Does A Central Air Conditioner Use?

A central air conditioner’s amp usage varies according to the unit’s size and BTU rating. A single amp can deliver anything from 15 to 60 amps of electricity. In addition, it can handle voltages between 208 and 240 volts. It’s best not to utilize central air conditioners like portable or window air conditioners because of their massive amps and voltage requirements. Hardwired into the house is the preferred method.

As previously stated, the amount of amps an air conditioner uses depends on a number of variables. All of these factors are taken into account: voltage, power, cooling capacity, and size. British Thermal Units (BTUs) are the most used unit of measurement for this. The higher the BTU rating, the more amps are needed.

An air conditioner’s amps rating shows you how much power it consumes. Per unit time, the amount of electricity it consumes. In order to determine how much electricity the air conditioner uses, you must know the amp rating. The cost of electricity can be estimated in this manner.

You can examine the air conditioner’s label or the user handbook to find out how many amps it draws. Most of the time, it is made clear. There are two simple measures you may do to find out if it isn’t. It is important to know the air conditioner’s capacity or BTU rating in order to make an informed decision.

Divide the EER (energy efficiency rating) by the Watts (power rating) to arrive at this value. In most user manuals, you’ll find ratings for things like energy efficiency. It can range from 8 to 12 BTUs for air conditioners with 5000 to 18000 BTUs.

Once you’ve calculated the BTU rating of the air conditioner, multiply it by the voltage to get the current in amps. then divide the EE rating by the previous answer to get the amps of current in a circuit The majority of the time, 115 volts are needed for air conditioners up to 15000 BTU.

115 volts can be used if the voltage is not specified and the BTU is less than 15000. When shopping for air conditioners, my recommendation is to always choose for models with a higher Energy-Efficiency Rating because they require less power.

As a result, you’ll save money on your electric bill and have more to spend on other necessities. You should also consider the size of the air conditioner in relation to the amount of space you have in your home. Be wary of assuming, at great expense, that a higher output means better cooling and, therefore, more energy savings.

A Complete Guide on How to Install a Window AC Unit in Your Room

You’ll end up paying more for electricity if you choose one that’s too large for your room. You’ll spend more money and get less in return. Large air conditioners are unable to remove all of the moisture from the air.

Also, don’t buy an air conditioner that’s too tiny for your room if you can help it. If your air conditioner is too tiny, it will have to work nonstop for much of the day in order to keep your home at a comfortable temperature. As a result, you’ll be paying extra for electricity as a result of this.

Because of this, the size of your room’s air conditioner should always be proportional to its size. It should be neither too small nor too large.

Using an air conditioner with a higher amp rating than the circuit breakers in your home is also a safety precaution. If your air conditioner consumes more than 30 amps of power, you’ll want to install a 240 volt circuit breaker. When in doubt, call a seasoned electrician right away.

How Many Amperes Does A Portable Air Conditioner Use?

Portable air conditioners consume a specific amount of amperes based on their BTU rating. Most 8000 BTU to 18000 BTU portable air conditioners use between 3.52 amps and slightly under 20 amps of electricity.

As an illustration, an 8000 BTU air conditioner draws between 5.8 and 8.7 amps of power. To put it another way, a 10000 BTU air conditioner uses anywhere from 7.3 to 10.9 amps of power.. An air conditioner with a 12000 BTU rating, on the other hand, consumes between 8.7 amps and roughly 13.1 amps of current.

Furthermore, an air conditioner rated at 15000 BTUs uses anywhere from 10.9 amps to 16.3 amps of electricity while running at full blast. An 18000 BTU air conditioner, on the other hand, consumes between 13.1 and 19.6 amps of power. Because of this, you can see that the more BTUs an air conditioner has, the more amps it needs. Consequently

With BTU ratings greater than 15000, air conditioners must be plugged into a dedicated outlet rather than a normal outlet. This is to prevent it from being ruined by the extra current demands.

An air conditioner’s energy consumption is quantified in BTUs. The abbreviation for British Thermal Units is BTU. When your air conditioner removes heat from your home’s air and releases it outside, it consumes this amount of electricity.

Because of this, a unit with a larger BTU rating is more effective at this task. This does not imply that purchasing an air conditioner should cost you a small fortune.

A 5000 BTU air conditioner will chill a 150-square-foot room just fine, for example.. However, while choosing a portable air conditioner, you should take into account more than just the size of the space.

Some additional things to think about are your home’s design and size, as well as how high your ceilings and air conditioners are and how much insulation you have.

How Many Amps Does A Window Air Conditioner Use?

Voltage ratings for most window air conditioners range from 115 volts to 220 volts. As a result, they need a power rating of between 3.5 and 20 amps. In terms of voltage, smaller quantities are 115 and 125 volts. Units with 15000 BTU or more are more likely to use 220 volts.

Before you buy a window air conditioner, make sure to check the amps rating. Because window air conditioners use more amps than other air conditioners and household electrical appliances, this is the reason.

How to Install a Window AC Unit - This Old House

Standard household outlets may power window air conditioners as tiny as 115 volts and 15 amps. To handle the high energy demands of bigger window air conditioners, a dedicated outlet is required for units rated at 220V and/or 20A.

Window air conditioners are capable of drawing up to 20 amps of electricity. However, the BTU rating of the air conditioner is a factor in this.

How Many Amperes Does A 5000 BTU Air Conditioner Use?

A 5000 BTU air conditioner draws between 3.6 and 5.4 amps of power. As a result, it can only draw a little more than five amps. It is also worth noting that these little devices have voltage ratings of between 120 and 120 and 120 and 120 and 120 and 120. Because of this, these devices may be plugged into a typical household socket and operated.

Small rooms up to 150 square feet should be cooled with a 5000 BTU air conditioner. To get the most out of the air conditioner, this is what you’ll want to do.

How Many Amps Does An 8000 BTU Air Conditioner Use?

Between 5.8 and 8.7 amps is required for an 8000 BTU air conditioner in operation. Window air conditioners and portable air conditioners are the most common models. For example, a 350-square-foot room needs an 800 BTU air conditioner.

How Many Amps Does A 10000 BTU Air Conditioner Use?

To find out the current BTU rating of a 10000 BTU air conditioner, look no further. Air conditioners with a capacity of 10000 BTUs draw between 7.3 and 10.9 amps of current.

Portable and window air conditioners make up the majority of them. The most efficient way to cool a 400-450 square-foot space is with a 10000 BTU air conditioner.

How Many Amps Does A 12000 BTU Window Air Conditioner Draw?

In contrast, a 12000 BTU Window Air Conditioner consumes between 8.7 amps and 13 amps of electrical current. Large air conditioners like this one use a lot of electricity, thus they need a special circuit to handle the load.

A dedicated circuit should be installed in your home by a skilled electrician if you don’t already have one. These air conditioners might be window, portable, or mini-split kind of units. A 12000 BTU air conditioner is ideal for cooling a room that is 500 to 600 square feet in size.

What is the difference between amperage and other electrical terms differentiated in electrical appliances?

Amperage is not the only electrical term used to identify window air conditioners from other electrical appliances. Two other terminology used to quantify the cooling operation and energy consumption of a window air conditioner are voltage and wattage.

In order to understand how your window air conditioner works and the amount of power it consumes, you should familiarize yourself with these terms and their definitions.

The electrical likelihood of two points can be calculated based on the voltage of the device in question. Amperage draw will be lower if the window air conditioner has a high voltage, allowing it to run for a longer period of time.

The amount of electricity flowing between two locations in a volt at a time is measured in amperes or amps.

If you’re concerned about how much electricity your window air conditioner will need to run, you’ll use the phrase “wattage.” Your electricity statement will show the wattage of the appliance you are using, along with the name of the manufacturer.

So, if you’re thinking about acquiring a window air conditioner, be careful to check the amp draw of the device. Knowing this will help you choose the correct cooling capacity for your room, and it will also help you identify what kind of unit you need.


During the sweltering summer months, everyone needs an air conditioner to keep cool. It’s important to know the amps rating before making a purchase, though

The amps rating of the air conditioner, among other things, is determined by the BTU rating. Generally speaking, the smaller the BTU rating, the lower the amp draw. Air conditioners with larger BTU ratings, on the other hand, necessitate higher amps of electricity.