Well if there is a resistance that stops the motion of waves that produce heat, it would be good enough to cancel out the effect of heat in the medium, but that already exist in electricity, and also in heating/cooling systems, like insulation, as insulation is not a conductible a medium for these types of waves .
So the only thing that comes to my mind, something that can alter these wastes, at that level, has to be something that moves at the same speed or in the same frequency.
So heat wave vibrations with Light frequencies instead of a magnet. Like a light frequency that can alter the motion and sync of the original heat waves, or sound waves. Some way to flatten the wave into a line, or stop the oscillation in the medium, would in theory allow an object to remain completely cold in, say, a volcano.
Maybe it is the development of the manipulation of waves, the technology that allows UFO's to not sound or not heat up or to do all the things that they can do, including moving at such speeds by eliminating the resistance in the surrounding environment via wave manipulation; Because, one of the thing the C's mentioned is that once in 3rd density they are 3rd density , so they are ruled by the laws of this density.
I'm sorry I slipped into the UFO, but I couldn't help but to consider it. :)