 She also knew to enter and exit the house on the coolest side. It may not be the most convenient door to go in and out of, but it's cooler over there in the shade if you have a door on the shady side. And that's the one that she would tell you to go in and out of on the hot summer days so that when you open the door, it's not that quick vacuum effect where you're pulling in all that hot air as you come and go from your house.