The best trick is to add as much extra hot water to the tun at mash out as possible. The extra energy and water mass will reduce temperature loss (not the heat loss, just temperature). As was mentioned 120-130F is the critical point.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk