Keep the extension cord run from the outlet to the air conditioner as short as practical less than 12 ft 4 meters if you can.
Can you run a window air conditioner on an extension cord.
Replacement power cord air conditioner extension cord 5 20 ft.
Best portable air conditioners without hose.
The one you choose must be heavy enough to handle the load which for many air conditioners is around 12 amps.
You need a heavy duty extension cord that can carry the high current.
Normal extension cords can t handle as much electricity as permanent wiring so if you use one to plug in your ac unit the cord can overheat and start a fire.
Ductless systems do choose the right extension cord for the job.
In both cases the extension cord can overheat and cause a fire.
This will tell you the power you need for the extension cord for a portable air conditioner.
Choosing the right wire gauge.
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A window air conditioner should be installed close enough to an outlet to allow the cord to reach but when you need immediate relief from the heat you can use an extension cord for your new appliance.
Advice against using any extension cord is more for protecting you from the multitude of easy to screw up ways this could go wrong rather than an indication that it is impossible to do safely.
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I ve run 100 000 watt lighting systems on extension cords and it was safe to do so because the wiring was sized for the application.
Esfi also advises that you should never use extension cords with any kind of heater or with fans.
As with window units these heating and cooling devices should be plugged directly into electrical outlets.
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I would bet the instructions say not to use an extension cord at all.