There cannot be anything better than nice cool air con in the hit summer, but they are not really all the eco friendly. But by using the sun to power this up, just makes perfect sense.

1. The refrigerant, together with the salt or absorbent in the Generator, evaporates due
to the heat provided by a burner or an external circuit leading to a heat exchanger.

2. The absorbent is conveyed to the Absorber as a solution with a low refrigerant content,
while the refrigerant that has evaporated in the Generator travels to the Condenser where it is condensed and releases heat.

3. Due to the difference in pressure, the refrigerant flows to the Evaporator where, at a
low temperature and as a result of the low pressure, it evaporates and absorbs heat from the circuit which subsequently goes on to cool the room.

4. Lastly, the evaporated refrigerant is attracted by the absorbent in the Absorber, where
the refrigerant-rich absorbent solution is created once more and is conveyed to the Generator where the whole cycle begins again.

There is no doubt that this sort of equipment is going to be very expensive when compared to the standard type, but in the long run it has to be better.

Source [Tree Hugger]