Temperature won't go below 12 deg
Fahrenheit or Celsius? It could be a temperature lock, check manual for programming options on a digital tstat. It could be you need a new tstat. Go get a Honeywell programmable. It could be your air conditioning can't keep up to the demand because of improper sizing or airflow problems. If your sure it's not your tstat then call a technician to verify proper ac function.
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