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 x 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 (-300'K), gives H as 798'k
(525'C).
The exact temperature of Hell cannot be computed. However, Revelation 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 [sulphur] means that its temperature must be at or below its boiling point,
444.6'C.
We have, then, that Heaven, at 525'c is hotter than Hell at 445'C.
My tip in both cases ... wear suntan cream.
