I have 2 First Co. air handlers both 48 MBXB...one in the basement and one in the attic. When the temp is satisfied, the attic air handler stops blowing almost immediately or at most, continues to blow for 30 sec after the temp is reached. However the basement handler continues to blow well after the temp is satisfied...usually for several minutes after and when the air temp coming out of the supply has cooled substantially. Settings on the thermostat are the same. I can see how to adjust the blower speed, but I didnt see anything in the company's literature about extended blower settings or how to adjust the time after the temp is satisfied. Is this a wiring issue?