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Thank you for your interest in the LG LW1223HR.AT3AUSL model. It is not recommended to replace a central air conditioning system with two window units in a 1400 square foot house. The size of the air conditioner needed for a house depends on the square footage of the house, and a central air conditioner is designed to cool the entire house simultaneously. You can download its owner's manual through this link for more information: https://www.lg.com/us/support/product/lg-LW1223HR.AT3AUSL. ^Cris
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