If one plots the speed of the pendulum as it swings back and forth, the graph would be a sine wave. At the top of the arc, the speed is zero. Then it begins to travel faster and faster until the bottom of the arc.
“Today we are building better houses than we ever built before, and part of that component is that we air-seal the houses. It’s the best thing you can do for an occupant, energy-wise, because the cost of heating is reduced considerably, and a house is easier to cool.