The Cosy Cabin has a forced-air furnace, which means hot-air vents are to be found in the various rooms. This is a revelation to the beasts, none of whom lived with me so long ago as to remember the house I had with similar heating. Used to heat coming from hot-water pipes laid out along the bases of walls, the warmth blowing from certain points in the floor have appealed to some of them.
I remember my Josie liked the vents in the old house, though she especially enjoyed the air conditioned cool air blowing through them in the summers. For now, however, the currents cats are enjoying the heat.