My father's house has two different a/c zones. The "main" zone is the original part of the house. The secondary zone is the extension they built after Hurricane Andrew (1992). The secondary zone is smaller, but has a more powerful a/c. The air gets run pretty much year round because even when it's "not hot" (70's and low 80's), it's still wicked humid, and the a/c pulls the moisture out of the air.
Anyway, currently the primary a/c unit is misbehaving. My father has cranked up the secondary system and used fans to pull the air out of that part of the house and blow it into the rest of the house. This mostly works, except at night. You see, my bedroom is in the secondary zone. My parents insist that my dogs sleep in my bedroom with the door shut. This means that nearly all of the cool air from the secondary a/c is pumping straight into my room. The largest of the ducts going to the air vents goes to that room, as it was built with the intent of that room being a computer room, and dad wanted to makes sure that with 4-6 computers running, the room stayed cool. The thermostat, however, is in another room, so the system thinks that the temperature is higher than it should be, and keep blowing cold air. I stuck a digital wall thermometer in there, and when I woke up half frozen last night, I checked it. It was 54F in my bedroom. Dad really needs to get the primary a/c fixed.