How do I transfer my visa to my new US passport while in Chiang Mai?

To transfer your visa to your new US passport in Thailand, you cannot simply transfer a visa but can transfer an extension. You will need to take both your old and new passports to Thai immigration, along with photocopies of all stamped pages in the old passport and the face pages of both passports. Some expats have reported needing a letter from their embassy, while others did not require one. Make sure to check all details and expiry dates during the process. It is advisable to prepare a list of necessary steps for a smoother experience.