Trane's older 4TEE air handler had 4 dip switches to set the cooling and heating CFM/ton airflow setting independently. The newer TAM7 only has two dip switches to control "CFM/ton." For instance with the 4 ton model, if cooling is set to 370 cfm/ton, heating is automatically 420 cfm/ton, and if cooling is 390 cfm/ton heating is 440 cfm/ton, etc. Can anyone explain why Trane would do this or how it is beneficial (besides simplifying setup)? This seems like a limitation as a home's ductwork may be able to support 1560 cfm for a 4 ton heat pump system (390 cfm/ton), but the resultant heating cfm would be 1760 cfm which may be pushing the limits in terms of air velocity and static pressure. The heating cfm in this case is indeed the airflow for heat pump mode, not electric heat, as described in the TAM7 sequence of operation.