It is perhaps worth pointing out that Heaven is actually hotter than Hell. My full source for this is a book called "A Random Walk in Physics", published by the UK Institute of Physics, but apparently the original is in Applied Optics, II, A14 (1972).
In summary, the argument uses Isaiah 30:26 "The light of the Moon shall be as the light of the Sun and the light of the Sun shall be sevenfold, as the light of seven days." After various complex arguments (and using the Stefan-Boltzmann fourth-power law, which is familiar to you all, I'm sure) this gives the equation:
(H/E) ** 4 = 50, where H is the temperature of Heaven and E is the temperature of Earth.
This implies the temperature of Heaven is 525 deg. C. By contrast, the temperature of Hell must be less than 445 deg. C, the temperature of the lake of boiling sulphur (see Rev 21:8.) If it were any hotter, the sulphur would be a gas, not a lake. Thus Heaven is hotter than Hell.
