Abstract: An absorption chiller having a generator absorber heat exchanger with a split device for directing a first portion of strong solution from the absorber to the generator at a first temperature, while simultaneously directing a second portion of strong solution from the absorber to the generator at a second temperature. The absorption chiller operates to transfer weak solution from the generator to the absorber at a temperature of about 265.degree. F., while transferring strong solution from the absorber to the generator at two different temperatures--preferably about 210.degree. F. and about 240.degree. F.