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)^4 = 50,
where E is the absolute 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.