When 71 = 64

It's 3pm and about 32 degrees here. Since I've been stuck in the house absolutely freezing, I cranked the heat up to 71. After several hours of still feeling cold, I went to check the thermostat. It was still set at 71 degrees, but the actual temp was down to 64! 64!!! That's not very close to 71! Hopefully my husband knows how to fix a furnace...If not, I guess I'm baking cookies all night long to help the baby stay warm.