The best of both worlds is not being inside or outside, but inside and outside! We have had some very cold frosty weather. Feeling the warmth of the sun in the southern window, Marigold and Opie wish they could be outside. They look at me with asking eyes, but the answer is no to them!
A short while later the two big boys Zeke and Scooby are insisting the catio be opened up for them. I relent. Zeke jumps right out. I may have well just put him in the chest freezer, as it is so cold!
Scooby is not so hasty to jump outside. He knows a secret–well, it is not a secret–everyone knows it, but only one cat at a time can enjoy it.
Scooby knows the furnace is on, and blowing warm air up out of the vent below him, so he can sit in the window with his nose in the cold, and his body being warmed!