No. I don't know the immigration requirements in Hua Hin. Each offuce seems to have slightly different requirements. I've never dealt with the Hua Hin office and don't plan to as its not a destination I would consider living. 1 day there is enough for me.
I strongly suggest you rent for the first 1-2 years to make sure Hua Hin and specifically which area of Hua Hin is for you. Its simple to hand back the keys but very hard to sell if you change your mind.