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Hello, thank you for your question. We recommend you match your air conditioner to the square footage of the space it is installed in so that it will be able to properly cool the area. If the area of the stairwell and attic match the covered square footage of this air conditioner, then it will sufficiently cool the area. We hope this helps! Please don't hesitate to reach out with any further questions or concerns. -Chris@GEA
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