It's bad news, but it's important. In short, the contention now is that Celani did not account for effect of pressure changes within the cell. Reducing the gas pressure reduces the thermal conductivity of the gas. This reduces the temperature of cell components like the metal flanges that are mostly heated by the gas.
So at lower gas pressure, the flanges don't get as hot and so don't radiate away as much heat. But the electrical heating is constant, so measured temperatures at other points in the cell must rise. HUG is contending that this pressure-modulated rise in temperature elsewhere in the cell is what Celani measured as excess heat. http://www.quantumheat.org/index.php/follow/163-a-partial-explaination Jeff

