Carrier Performance EDGE Owner's Manual page 51

Auto changeover
The thermostat displays oneoffivemodes:
heat, cool, Em heat (heat
pump version only), heat cool (auto mode) and off. When the mode
selection is for both heating and cooling - auto mode - the thermostat
is in auto changeover mode, This allows the system to switch from
heating to cooling - or from coolin 9 to heatin 9 - to maintain the
temperatures you've programmed, It does this automatically,
Smart Recovery
The Smart Recovery feature transitions your home from one temperature
period (wake, day, evening, sleep) to the next so that the your home's
temperature matches the temperature setting at the start of each time
period. This means, for example, that if your sleep period temperature
setting is lower than the period that precedes it, the thermostat will start
cooling down the home before the beginning of the scheduled sleep
period. It does this at an energy-efficient rate. This not only helps make
your home as comfortable as possible, it also makes your thermostat
more cost effective. Call your dealer to adjust Smart Recovery settings.