I have been using the mini oil radiator heater, but my 60 lb.er has grown so that it's a tight fit in his 2' x 4' insulated night box. Not in a position to make a new box at the moment, wondering if a radiant panel (same as Kane heating mat?) would keep it warm enough in So Cal winters. Or how about a CHE if mounted at the other end of the box from where he sleeps? Thanks for any help!