somewhat...? I had the same results trying a black rubber dish set inside a nonworking big dog bowl lined with hay. kept it going for maybe 6 hours in above zero weather. funny thing is when I would take the rubber dish out, it could be frozen solid and there would still be some unfrozen water in the bottom of the plastic outer dish.
now have to look up airguns...
yesterday I was cleaning up the coop - came in and saw the nest on the floor behind the door, eggs in a pile...15 minutes later the eggs were lined up. Now that had to be a chicken- no way would a rat do that with me makine a ruckus just a few feet away. i hope.