Good: found the LED headlamp I bought years ago and put it to use.
Bad: it needed using because I had to explore the attic to figure out why the ventilation fan wasn't running.
Good: fan's thermostat trigger was just set all the way up for some reason, easy fix!
Bad: fan makes disgruntled noises and only very, very slowly turns when it is kicked on, even after making sure there's nothing clogging it. Seems like a recipe for a fire later. Set it back to 'all the way up' (no off switch), calling HVAC people tomorrow.
Good: remembered to replace the AC filter while I had the ladder out.
Bad: clambered all over the attic in my good around-the-house pants, oops.