In my childhood Fedders air conditioners have been rather common and back in the day in the 1970s and '80s they were the quietest and most efficient for the technology available then before inverter air conditioners started popping up somewhere into the 21st century. They would cool a bedroom almost immediately and even the biggest ones were surprisingly quiet.
So given to what my folks tried among air conditioning brands this TCL is one of those new-tech innovators that take what a Fedders could do to a whole new, different level!