Broder turned the heat up before turning the heat down. But he didn't mention turning the heat up; he only mentions having to suffer with a cold cabin.
Also, that's the heater setting, not the cabin temperature. I can set my car's internal heat setting to 50 degrees after getting it nice and toasty, and as long as I don't turn the A/C on it's going to stay warm for quite some time.
Quite a few newer cars don't draw a distinction between running the heater or A/C: you just set a desired temperature, and the climate control system figures out what to do based on internal and exterior conditions. (Whether this is a good approach for a car's climate control system is another question, however.)