Ralf Hutter wrote:
I use one of those oil-filled electric heaters that looks like an old-fashioned radiator type heater. It's dead quiet, heats nicely and is cheap to run.
Something like this
, but mine is about half that height.
I was going to suggest the same thing. You can get smaller ones about the size of a cereal box too, so maybe that's what Ralf has.
The only problem with them is that they are designed to heat up a room and rely on convection. I don't know how well they'd transfer heat if you were to try blowing air through them like a radiator...
If you're just trying to keep your feet warm though, what about laying an electric blanket or bed warmer on the floor under the desk? Completely noiseless and probably cozy as well.