Your question is phrased a little odd.
1) If when you say 'thermostat' - you are actually talking about a 'temperature reading' on your thermostat - then I would tell you to just get another temp measuring device and double-check the temp.
2) if howerver you are talking about the set-point of your thermostat - for example - you might have it set on 70 degrees and the room temperature is 78 - then I would say that the AC is not big enough to pull the temp down to 70 in the room, or, you have a problem with the AC that does not allow the unit to pull the temp down.
good luck!
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