Calrad 55-788B 6-Inch 3-Prong AC Extension Cord

so I recently had a viewer who asked me a question about a portable AC which we have talked about before but he had a couple other points that I wanted to discuss so this you that he has was he has 100 amp service and he put a portable AC in one of his rooms now the portable AC is overloading the circuit and it's tripping the breaker whenever he uses it so he can't use the lights in Kings the microwave and the TV and everything all at the same time so he was wondering if he could run an extension cord from the Attic in I guess in another area from you know from the Attic down to the portable AC in it so that he could not have to deal with the breaker tripping thereby taking the power from another part of the house or another circuit in the house so in theory this is actually a good idea to kind of balance the electrical load but there's a couple of issues which I mentioned to him but I