Standard extension cord vs heavy-duty air conditioner cord: Standard cords are dangerous for AC units

Standard household extension cords (16- or 18-gauge) can overheat and start fires when used with air conditioners. Heavy-duty AC cords (12- or 14-gauge) are built for continuous high current draw with better insulation and connectors. Always check your AC’s amp rating and use a cord that matches or exceeds it—don’t risk a fire to save a few bucks.