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For a wrong result, include the outdoor temperature and unit, your window, AC, heater, fan and room size choices, and the estimate you got.

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What you can write to us about

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We can't measure your actual room temperature or diagnose problems with an AC or heater. For an exact reading, use an indoor thermometer, and for equipment faults, contact a qualified technician. To see how the estimate is produced, read the Methodology.

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