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Hello there, Ying! Thank you for your inquiry about the LW1223HRSM air conditioner. This unit is capable of cooling spaces up to 570 square feet and provides heating performance with ratings of 9,200 BTU for low temperature and 11,200 BTU for high temperature. In winter, it can effectively heat your room, depending on outside temperatures and insulation. For optimal performance, make sure the unit is installed correctly and maintained regularly. If you have any further questions or need assistance, please send us a private message on Social Media @LGUSSupport. We’re here to help, and we appreciate your patience! —Avril
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