Both of us have a pretty ridiculous dog at home, one thing that the dog managed to figure out is the fact that the Heating, Ventilation, and A/C vents in different locations of the house are loose, however you can’t entirely keep them shut as they are so easy to pull open.
The dog l gained this and started walking around in the air duct, but both of us make sure the dog is never in there while using the Heating, Ventilation, and A/C system, however occasionally she manages to get in there, then she likes to travel to different parts of the house through the air duct.
Both of us have a single story house so most of the air duct is level. It’s ridiculous occasionally seeing the dog and then abruptly seeing her in a different part of the house when she never saw her wonder past you. That’s regularly a clear sign she has been playing in the air duct. Both of us are regularly trying to secure those Heating, Ventilation, and A/C vents but she regularly figures out a way to chop in. She is a actually strong cat, so I know I can’t say that I am surprised. One of these nights all of us will figure out how to keep her out of there. I certainly don’t want her to get sick from being too hot if the oil furnace was running or too chilly. Then again, I don’t know she might like that sort of thing. She seems to savor it when the cooling plan is running. Both of us don’t crank the a/c too much anyway, so it actually feels nice inside of the air duct plan when all of us are using the cooling system.