If it was negative 75 degrees outside and the heat failed in a house, how long would it take the inside of that house to get below freezing?
When I was a kid, maybe 10 or so (circa 2002-2003), I was talking about Antarctica with my dad and he said "if your heater broke, you'd die" there. 75 below is a typical temperature in the dead of winter in interior Antarctica. By the way, the house in this scenario is a typical house as would be constructed in the Northern United States (the buildings in Antarctica are probably much better insulated)
Negative 75 degrees Fahrenheit (negative 59 degrees Celsius)