They are called https://en.wikipedia.org/wiki/Absorption_heat_pump
But they are much less efficient that electrical ones, adding even a small amount of electricity to the cycle (even if the primary energy is heat) can dramatically improve efficiency.
They are called https://en.wikipedia.org/wiki/Absorption_heat_pump
But they are much less efficient that electrical ones, adding even a small amount of electricity to the cycle (even if the primary energy is heat) can dramatically improve efficiency.