Sound, No not necessarily. 12 guage is code for 20A. This topic is covered in other threads, but I suggest you call a licensed electrician.
Upgrade Receptacle on 15A breaker
I have seen suggestions for 20A upgraded AC wall receptacles to receive the power cord, but shouldn't a line with a 15A breaker go no higher than a 15A receptacle? Same answer if wire used from receptacle to breaker is 12 guage? Assume location in is in US. If 15A receptacle is required, what is a good one?