I grew up in a small one that did have central "air" in the form of an attic fan. At about the center of the house there was a ~4 foot fan mounted in the ceilin

I grew up in a small one that did have central "air" in the form of an attic fan. At about the center of the house there was a ~4 foot fan mounted in the ceiling, concealed by louvers that opened when the fan turned on.