My Carrier variable speed has lots of jumper selections in the air handler to choose many features that all affect the fan speed. Some only affect the fan speed when it is manually turned on but some others involve the auto speed.
Be advised that many installers do not know how to properly connect the control wires for a variable speed system. Mine was wired just like a unit without the variable speed and very weird things occurred.
You will need the installation manual and owners manual both to figure it all out if it has all of the multiple features mine does.
If you have the option to add the outdoor temp sensor, I would advise doing that since it should then let you program the aux heat to stay off even when raising the t-stat several degrees. For example, keep the electric strips off unless it is below a certain temp outside. They will still come on during the defrost cycle to help knock off some of the chill caused by that cycle.