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Thank you for your inquiry! The Insignia™ 21 Cu. Ft. Garage Ready Convertible Upright Freezer with ENERGY STAR Certification typically uses R600a refrigerant, also known as isobutane. R600a is a common and environmentally friendly refrigerant used in many modern freezers and refrigerators due to its lower global warming potential compared to older refrigerants like R134a. Keith | Insignia Support https://www.bestbuy.com/site/insignia-21-cu-ft-garage-ready-convertible-upright-freezer-with-energy-star-certification-white/6336452.p?skuId=6336452
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