Heat transfer is any or all of a number of events that are thought of as mechanisms and that transfer energy and entropy from one place to another. Heat transfer will only occur when the two objects that will interact has different temperatures. If not, heat transfer will not occur due to both objects having the same temperature i.e. it's equal. Like subtracting the same number to itself, its difference will be 0--Hope I could help! Good luck on your future endeavors!