You are allowed to bring 20,000 U.S. into Thailand. Then with draw the rest from atm but you still need a bank account and harder to get now. You need a long term visa OA 1 year and lease agreement .
Daikin has a gecko free unit 24k btu that I am thinking of buying next time as they have been shorting out my mother boards on my 14 year old Mitsubishi units and parts are hard to come by now.
No big deal pay fine and leave unless you are stopping and arrested then anywhere from 2 weeks to a month sleeping on the floor in the detection center and then deported back to your own country and banned from Re-Entry into Thailand for the next 5 years. $ 1000 baht at the airport or 1900 baht at immigration to extend your stay for the remaining time before your flight out. Up too you as they say in Thailand but they have check stops out all over the place very risky if you ask me.