The Climate Control Door:

In the spring, the door to our attic becomes a tricky climate control. During the winter, closing the door prevents heat from escaping up and out through our rather uninsulated roof. During the summer, keeping the door open allows unwanted warm air to collect in the attic (unless we're using the attic and want it to be cold). In spring, as the weather shifts among the fifties, sixties and seventies (F), the ideal position for the attic door changes often. When to open or close it becomes a tough judgment call. (And no, I don't want a temperature-sensing device to auto-control it. Too expensive.)