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Hi Insignia customer, thank you for reaching out. No, you should not use an extension cord with the Insignia NS‑UZ21WH0 Upright Freezer. For safety and proper performance, the freezer must be plugged directly into a grounded wall outlet. Extension cords can overheat, cause voltage drops, and may damage the appliance or create a fire hazard. Faisal | Insignia
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