4 Things to Know About Extension Cords for a 15-Amp Window AC

Use a 12-gauge cord, minimum A 15-amp air conditioner draws near the limit of a standard household circuit. A 14-gauge cord at 50 feet drops voltage enough to make the compressor work harder and heat up the wire, creating a fire risk.

10-gauge is overkill for short runs 10-gauge handles the load safely, but you only need it for runs over 100 feet. For 50 feet or less, stick with 12-gauge.

Choose an outdoor-rated cord Even if used indoors, an outdoor-rated cord is heavier-duty and safer. It handles the constant load better than a cheap indoor cord.

Plug directly into a wall outlet Never plug the AC into another extension cord or power strip. This is a fire hazard, not a phone charger—don’t cheap out.