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EER is Energy-Efficiency Rating that you can usually find in specification sheets of 5,000-18,000 BTU AC units. On average, EER ranges from 8 to 12. These numbers are also used to calculate the Amps intervals in the table above). Example: Some homeowners are interested in how many amps does a 5,000 BTU air conditioner use. Of course, you also have 6,000, 8,000, 12,000, 15,000, and 18,000 BTU devices that use more amps than 5,000 BTU units. From the table above, it’s evident that window and portable air conditioners can draw anywhere from 3.52 amps to almost 20 amps. If you were me would you take a chance in putting said 15,000 btu air conditioner on a 15 amp circuit? Another nice tweak for demonstrating calculations is to have the correct number of digits and decimal places, such as showing 1500 for the number 1500 rather than 15000. Just a nice tweak, so it’s not off by, oh, a factor of 10 or so. Thanks. Reply
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Hello Luke, two 5,000 BTU 115V window units running simultaneously will require about 1000W; that translates to about 10 amps. For that, a 15 amp breaker should be sufficient; you will only have problems with the startup voltage that can shoot the amps above 20 amps. The washer will require about 2000W; you have correctly figured out that it’s impossible to run the washer and window AC at the same time. Hello Shayan, the table is calculated based on two factors; 1) BTU cooling output, 2) EER rating. Based on these two factors, you can calculate the wattage. With known voltage (115V circuit), you can calculate the amps. Hope this helps. Reply
However, it doesn’t draw 100% more amps. In fact, it draws 67% more amps to achieve a 100% more powerful cooling effect. It is thus more cost-effective. The higher energy-efficiency device from Example 2 (12 EER) delivers 100% more cooling power than the 5,000 BTU device from Example 1 (10 EER). The best battery-powered unit – the Zero Breeze Mark 2 – can deliver 2,300 BTU of cooling power with just 24V electrical potential. Hello Handsome Dan, it’s true that AC units have a startup surge. Depending on the unit it can be 1.04 to 2.00 times the running wattage. Now, in the worst case, an 11 amps Frederich 15,000 BTU unit will have a 22 amps surge. But most likely, the max. amps are much lower; below 15 amps. So, first of all this was very interesting for a novice, but I am still confused.. I have a new Window Air Conditioner U shaped by Midea 8000 BTU. ISSUE: The cord is too short to reach the plug in?
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Example 2: How many amps does a 12,000 BTU mini-split use? We can see from the air conditioner amperage chart that it draws about 13 A. For now, you could run both units on a 15 amp breaker. If you see that you have problems (which is rather unlikely given these are very small units), you still can connect two 15 amp breakers. Hope you find this helpful. Reply Usually, we size air conditioners based on capacity (measure in British Thermal Units or BTU for short). You can see how the size of AC units is calculated based primarily on square footage here.Hi, I’m a mathematician so your formula 1 and 2 interests me. I wanted to suggest to use the multiplication symbol for multiplying and the divide symbol for dividing. 13,500 is not equal to 1500 divided by 9. Table: How Many Amps Do Window, Portable, Mini-Split Air Conditioners Draw Air Conditioner Capacity That means it needs 27 amps to power the whole AC unit. That is, in comparison, higher amperage than it’s needed to power an 18,000 BTU portable air conditioner (about 13-19 amps). Advice On Buying Cost-Effective Air Conditioners
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In short, you always want to invest in an air conditioner with a higher EER rating. As we’ve seen by comparing Example 1 and Example 2, a higher EER rating can significantly reduce the electricity consumption of an air conditioner.You’re right, we don’t have adequate knowledge about these surge wattages/amps because manufacturers don’t really include them in the specification sheets. Hopefully this would change in the future.
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