Now that the winter is here I have my thermostat set to 70. That
sometimes seems a little low. When I push it up to 71 it seems a
little warm. The place I notice it the most is when I am setting at
my computer desk. I have on the wall behind it. The desk does not
cover the vent.

I can imagine that people using the Celsius scale would notice one
degree more or their thermostat has half degrees.

I also found this at the roulette wheel of knowledge.
http://en.wikipedia.org/wiki/Fahrenheit