It varies from state to state! Stop saying "The ACA raise health care costs!" then "no it didn't!" "yes it did!" "no it didn't!"
If the ACA laws match what your state already had, then the plans will remain the same and the costs will remain the same. If the ACA requirements were higher/stricter than what your state required, then your insurance benefits and costs will increase. If the ACA requirements are lower than what your state required, then... I'm not sure...
I live in Maryland, where most but not all of the ACA rules were already in place. My individual health insurance plan will change very little. It was +/-10% from what my employer offered. The ACA now requires a few provisions that resulted in a nominal increase in my health care costs.
My local NPR station, WYPR, has had a program "Maryland Morning" where they have been going over this for months. They compared to other states where costs are going up because those states allowed health care plans that covered nothing but hangnails and scraped knees.