This measurably and repeatably works in my house. One side of my house gets cooler and one gets hotter depending on time of day. I setup one fan to blow in cool

This measurably and repeatably works in my house. One side of my house gets cooler and one gets hotter depending on time of day. I setup one fan to blow in cooler air and turn the other one to blow out hot air, and I've seen the temperature drop by as much as 3c° over the course of an hour, when outside temperature did not change. Other configurations did not do this.