I'm not sure about it heating a room, but our mouse must have been in rodent Nirvana as he dined on peanut butter, and seeds, bathed in its warmth. I only know this , because Megan went in the garage and witnessed it. Both traps failed to spring shut, so I reloaded them with peanut butter, and hoped that over night I would hear it's tell tale pop. It didn't happen. The mouse however, did enjoy his second course of peanut butter.
Today, Oliver got to live out one of his dreams, by skating on our frozen pond.
And I came across this as I was going through some of my vintage ephemera. Ask me how depressed I am now.