What is the Minimum breaker size required by NEC for #14 Copper wire feeding a A/C minimum 18.5 amp and 25 amp Max over current protection?

[texie]

Yes 14-2 romex

14/2 NM would not be compliant for a MCA of 18.5. # 14 MC or pipe and wire with 75 degree conductors would be compliant. Please study all the post, particularly post #10, so you understand the NEC rules and concepts.