In ran a 190 when i initially did the motor install. Ran around 220 degrees in the fall last year. I know there are different schools of thought but I was concerned running that hot for extended period of time may be an (expensive) issue longer term. After the weather started to warn up, it was running hotter and then with the AC issue, i attempted to run the 160. Not sure what a fosdick fan is so can not comment on it.