How Heat Can Cool

Someone has finally figured out how to convert the excessive heat due to global warming into electricity. The basic idea is to use a synthetic fluid that boils at a very low temperature (58 F). Thus, the steam can drive a turbine. We're a little confused on how "Ambient cooling" can get the liquid back to 58 degrees if we are using to it air condition our house (presumably when it is warmer than 58 degrees).