Read all of my post, though.
Many of us here in some San Diego areas rarely use our furnaces. I’ve been in my home here for four years and have used the furnace maybe a total of 10 times, so it is plausible for rodents that get into my attic to get into the furnace and make their home for several months, raise their young, and get out before I fire up the furnace.
Now, Toronto, well, that’s a different story.
Peter’s over in Olympia, Washington, so I think it is not only plausible for his area, but possibly likely.