I work from home and my office is in a basement with no heating or air conditioning. I use an electric radiating heater under the desk so that the heater is pretty close to my body. Yes, it does end up heating the room, but being close to it helps take the chill off. And it is only 700 watts max.

Of course I still have to wear warm clothes.

In previous years, I really struggled with my feet. But I recently bought a heated foot pocket thing, and I love it.

Now when it gets extremely cold outside I only have minor issues with my fingers and nose getting cold. Still not perfect, but close.