help to fix a cold floor?

help to fix a cold floor?

The floor in my cabin (16'x32') is ridiculously cold. I know this is because the floor is only six inches thick, that's not nearly enough R. The cabin is elevated 4 feet off the ground to eliminate permafrost complications. Giving the cabin a skirt (like people do to elevated trailer homes) is not an option because of the permafrost. I rent, so installing wall-to-wall carpet, floor tile, or the like is not an option. We do have two large carpet squares and four small area rugs that help somewhat, but I can't even stand on those in my bare feet. (of course, I'm normally bundled up to compensate for the low setting on my heater, but just as an example...) I know it's a long shot, but does anyone have any suggestions that will work in my situation?
My first apartment

My first apartment

Fleeting beauty

Fleeting beauty

Oh noes! Garden pests!

Oh noes! Garden pests!

New apartment!

New apartment!

Hi!

Hi!

A Positive Garden Note

A Positive Garden Note