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Several possibilities: has it always been this way or is this something new, in which case the unit may not be operating properly....dirty clogged filter? Low coolant? Does the air seem to be moving? If its always been this way the unit may be undersized. Is the attic properly insulated? Regardless, adding more may help.

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Q: What could be the problem if a small HVAC unit located in the attic is not able to keep the upstairs cool on very hot days?
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