Is it too low to keep fighting fish in an air-conditioned room?

It depends on what kind of fighting fish you have. Thai betta fish are tropical fish and may be hung in air-conditioned rooms. The water temperature needs 22-28 degrees. If it is China's fork tail, it can live without water temperature of 6-30 degrees, and the wild fork tail can live as long as it is above 0 degrees. Of course, you'd better not put the fish in the air-conditioned room. Both hot water fish and cold water fish like this water temperature of 22-28 degrees.