Before purchasing a window air conditioner, it is important to note the electrical requirements as window A/C units are typically more powerful than standard household appliances.

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Most common voltage ratings for AC units are 115, 125 and 220 volts, and amperage rating can run from 15 to 20 amps. The lower two voltage ratings are common in smaller units, while units with a rating higher than 15,000 BTUs will require a 220-volt circuit.

Smaller units with a 115 volt and 15 amp requirement will be able to operate off a standard household outlet. However, larger units that have higher energy requirements need a committed outlet to handle the electrical current required for operation.

If you already have a committed outlet for your AC unit, you’ll want to try to select a replacement with the same ratings and plug type to eliminate the need of having a new outlet professionally installed by an electrician. If you’re installing a new unit, take note of the wattage, voltage and plug type indicated.

Plug types are listed by their NEMA (National Electrical Manufacturers Association) classification and will often include a picture of the plug receptacle for your reference. Some of the most common examples include:


Note: Extension cords can be used when needed but only cords rated specifically for window air conditioners or other similar gauge home appliances should be used. See packaging for certification, voltage and amperage ratings prior to use.

Filed Under: A/C & Heating, Window Air Conditioners Tagged With: air conditioner, appliances, window air conditioner


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Gabriel Lim says

February 5, 2016 at 5:15 pm

I just purchased a Koldfront 18,500 BTU .It requires a 25 Amp electric source. I only have a 20 Amp circuit breaker and it works well with the cooling of the air conditioner. However when using the heater the demand for more electric power trips the circuit breaker and shuts off. If I decide to just use the air conditioner and not the heater, is a 20 Amp circuit breaker sufficient to power the air conditioner. If I upgrade my circuit breaker what would be the recommended amperage 25 – 30 amp?

Joseph Alexander Tate says

May 8, 2018 at 8:10 pm

switching out the breakers are really simple , turn the main breaker off ,then just pull out your old breaker ,look at wires ,they will be two ,just pull a little on the old breaker and the two cable ,that give you some room , you have two wirens ,remember castle , unscrew them and screw the wires in new breaker, but the new breaker back in angelatin ,and push in ,and all finiburned ,flip the main breaker and you are all good

its a good way to burn down your house. the fuse is supposed to melt and breakers release before the wire catches the house on fire. if its not a dedicated line to a range, dryer or water tank its probably only 12 ga or 20 amp max wire. 12 ga with 25 amps will get warm. connections will get hot. connectors and wire nuts get very hot and poof …. fire.

I have an Window AC unit with 220 Volt and the plug is tandem 6-15P. However, the wall outlet is for a perpendicular 5-20P. Is there an adaptor that can convert from one to the other or will I need to change the wall outlet.

I have a window unit 220,it just stop working don’t know what to do I unplug it for awhile though that would work but it didn’t HELP

please help me in this issue my ac is 2 ton window ac so how much ampere should i require to put in fuse box because when i turn on my ac the wire start burning

I have a window AC which make noise when i on it, a friend advice me to get 5000vt stabilizer to power it and i don’t know how true is that to be the course of the noise. Plz advice me, thanks


You will need a 20 amp breaker and 12/3 wire. Remember that 120 volts times 20 amps is 2400 watts max, then 80% of that is 1920 watts; anything more than 1920 your breaker will flip off. I own a 15,000 BTU unit and the max wattage it ever has used is 1450 watts, but generally between 1300 and 1350 is the norm. It is important to remember that your voltage throughout your house and neighborhood are higher in the morning and much lower in the afternoon. You are to go no lower than a 20 amp breaker and no higher than 12 gauge (the higher the number the thinner the wire). One final note…it is generally known that anything higher than 15,000 BTUs requires 230 volt. Double check your BTUs.

i have a 10.5 amp window air conditioner its on a 15 amp breaker also using a 14 gauge extenision cord works good until around 90 degrees then kicks off little confused.

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I am looking to get a a.c. unit for my 30 ft camper. Any recomendations. The only window that will work is at the back end away from the bedroom.

i have two 6000 btu air conditioners.Does anybody know if I can I run both on a single 20 amp circuit?Thanks!

I have a 24000 btu window type AC. What size breaker should it be wired to if using 10 ga. Wire?12-3 ga. Wire?

Ok, I don’t think i want to know about amps, what i have is a 115v – 60 hz new portable AC unit. Is it ok to plug in or not?

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