Woke up to a nasty surprise this morning.
The outer panel (double-glazed) of one side of our bathroom window (in our downstairs bathroom) was found cracked and broken. At first I figured vandalism and that someone had thrown something to break it during the night.
In closer inspection though, I could see no impact point on the broken pieces that was sitting between the two panes. What must have happened was that it was cold last night, and our furnace kicked in quite a few times. Well, that bathroom is just a small one (sink and toilet) and the door was closed. I surmise that the heat must have built up and contrasted with the cold outside and the window must have cracked enough to break it.
I will have to wait until tomorrow morning to get someone to fix it. Fortunately, the inner panel is intact.
Just one of those stupid things. Making sure to leave the door open in future.