need to add an extra outlet and put about 500 watts total on it...my electrical knowledge sux and I don't know any electricians, so...is it safe to run a long heavy duty extension cord from the room below? Where should I put a GFCI or circuit box? I was thinking: outlet-gfci-extra heavy duty extension cord-surge protector or cicuit box. That seems like too many. Cord warnings say: do not run under carpet, thru floor etc...what about a fire insulated cord? I am confused...what is the safest/best way short of adding an outlet?