I once lived in and old 1910 house with hot air heat. On the main floor there were wall mounted heat registers, and at the time I owned 2 cats who did not like the fact that I kept the house at 65 degrees in the winter. I took a large cardboard box and cut a flap door, and some flap windows. I then cut a an opening in the back to match the heat vent. The cats spent the next three months listening for the sound of the heater fan starting. As soon as it did they both made a b-line for the box. The heater usually ran about 5 to 7 minutes every half hour or so. After the fan shut down they would wander out until they heard the fan start again.
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