Buildings were optimised for doing the job without electricity. The walls, roofs and openings were in the right-ish places. If you can use power to heat/cool,

Buildings were optimised for doing the job without electricity. The walls, roofs and openings were in the right-ish places. If you can use power to heat/cool, you don't have to put a door in the climatically optimal position, you can put it wherever you want. So people do nowadays. That's all, really. No, let me give an example: if you have big windows towards the sun, the sun will heat the air behind those windows. You can then design the house so that the air stays mostly in place and the energy input will heat the house, or so that the energy input will stimulate airflow. Or you can forget about that when you build and just use air conditioning to heat/cool the house.