How old is the pond ?

If you want to flush out old bottom water then keep aerating. If you will have much plant/dirt ect washing in then keep aerating. Aerating will slow down the whole pond cooling process and will help keep the top water warmer (lower depthes may cool a little. Abrupt whole pond cooling is not good for fish and nither is cold water influx that can kill offf plankton activity. So it depends on your situation.