Read a story about a guy who tracked his car's oil pressure. Just numbers on a notepad. Saw a tiny drop each month. Turned out to be a cheap sensor going bad. Saved his engine. Your log did the same thing. It catches the slow creep you'd never see by just looking. Makes the fix obvious before it breaks.

You waited until after a near-drop in Austin to get a lifter? That's some serious luck right there.

What's the over-under on that guy just reading his own blog out loud?

Try a noise layer set to soft light, super low opacity.

So that temperature drop, is it like a sudden ten degree shift or does it need to stay cool for a whole season? My south facing room gets cold at night in winter but I don't know if that's enough.