"The temperature of Heaven can be rather accurately computed. Our authority
is Isaiah 30:26, "Moreover, 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." Thus Heaven receives from the Moon as much radiation as we do from
the Sun, and in addition 7*7 (49) times as much as the Earth does from the
Sun, or 50 times in all. The light we receive from the Moon is one
1/10,000 of the light we receive from the Sun, so we can ignore that ...
The radiation falling on Heaven will heat it to the point where the heat
lost by radiation is just equal to the heat received by radiation, i.e.,
Heaven loses 50 times as much heat as the Earth by radiation. Using the
Stefan-Boltzmann law for radiation, (H/E) temperature of the earth (-300K),
gives H as 798K (525C). The exact temperature of Hell cannot be computed...
(However) Revelations 21:8 says "But the fearful, and unbelieving ... shall
have their part in the lake which burneth with fire and brimstone." A lake
of molten brimstone means that its temperature must be at or below the
boiling point, 444.6C. We have, then, that Heaven, at 525C is hotter than
Hell at 445C."
[From "Applied Optics" vol. 11, A14, 1972]