In the midst of a St. Louis deep freeze, I'm not sure why I would seek out radio air checks from similarly cold days, but I have. I listened to one excerpt recently from a frigid night in 1977. After mentioning that it was zero degrees, the newscaster said, per the gas company, that thermostats should be set at 65 degrees; that way, there would be enough gas to heat all the households that need it.
That's an admirable goal, but only a 65-degree setting in zero-degree weather? If you can manage that without your pipes freezing, more power to you.
I prefer not to take that chance.