As Flying wild said. Just nod your head and agree, and take the money.
after all how many times have you got distracted, or had a sudden drop in temperature, and not switched it on until maybe +5 or + 6, and how many times have the engines stopped as a result? If you’re anything like me then the answers will be a few times and never, so it’s probably not worth stressing if they want you to turn it on at 9 degrees instead of ten.