I have a York duel fuel system. The settings on my thermostat are as follows:
1. Fan = ON
2. Heat = 68F
3. OD temp = 40F
4. ID temp = 68F
4. BP = 35F
I placed a digit thermometer at the furthest register from my furnace/A-coil. It is located on the second floor at the opposite end of the house. When there is a call for heat, the thermometer eventually reads ~7 to ~10 above 68F. When the call for heat cycle ends, the temperature reading slow declines until the output temperature is ~66F (less than ID temp).
Is this a "problem" with all HVAC systems when the fan is set to ON? Is there a fix to this problem?