Can I use an extension cord for my refrigerator or freezer?

Don’t. Refrigerators and freezers pull a big surge when the compressor kicks on, and most extension cords can’t handle it safely. A cord that’s too long or too thin will heat up, drop voltage, and can cause the compressor to fail or start a fire. If you truly have no other option, use a heavy-duty, 12-gauge, grounded cord rated for 15 amps or higher, kept as short as possible (25 feet max), fully uncoiled, and checked regularly for warmth. But honestly, call an electrician instead.