GFCI cord not long enough

Hi! Connie, You can use a heavy7 duty appliance cord for this. It has to be for air conditioners or appliance cord to be as short in length for use needed. I believe not to be longer than 8 ft or so. I had to buy one for my air cond. and needed only 2 ft and got a 4 ft one and no heating up of cord at all, and thats on a 110v and the larger too 12,500 btu and works great!! Can be found at most hardware stores best buy store or any appliance place that sells air cond should have it. The manufacturer is trying to avoid the buyer using a long extension cord like a 15footer and not heavy enought o handle the load either. Hope this helps it works great for us!!! Debbie

As long as the extension cord is not too thin or too long it will be fine. Use a 2.5 mm2 extension cord, even if it's 20 yards long it'll still be fine.

Standard extention cords are made for light draw applications like lamps and T.V.s. They are not heavy enough for the power that your A/C will draw. You can get an appliance extention cord that is made to handle heavier load such as you A/C. Most hareware stores carry them.