I made tomato sauce with browned pork roast pieces in it and cooked it for around 6 hours and left overnight by mistake until the next morning. Lots of sodium and water. My apartment a/c is set at 75 degrees C. Can this be safely eaten after reheated to boiling for an hour and then refrigerated before eating for dinner that night?
It is not possible that your A/C is set to 75°C. That's significantly hotter than the hottest outdoor temperature ever recorded on earth (54C or 129F). Yes, food held at 75 degrees centigrade is out of the danger zone. If, however, the A/C is really set to 75 degrees Fahrenheit (which is a normal room temperature), the food will not be safe, unless it is extremely acidic (compare ketchup). While salt can be a preservative (compare kimchi and salty pickles), excess water inhibits that effect.