I had a new A/C unit installed and now my hunter 44260 programmable thermostat is showing RE CO. The A/C unit seems to not be able to keep up right now and can only get the temp. down to 82 degrees. Our outside temp. right now is 97 degrees with a relative temp. of 107 degrees. What does the RE CO mean? and Is this normal for the A/C to not necessarily keep up with this hot of temperature?