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There are many factors that need to be taking into your question. Such as insulation factor, how many exterior walls, Demographics... Typically 1 ton of an air conditioner will remove heat from 500 square feet. 1800 square feet will need a 3.6 ton unit but they only make air units in half ton increments. You will need a 4 ton unit.

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15y ago
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Q: Btu needed for 1800 square feet?
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