Thoughts on the topic

If I charge the unit with a working substance R32 (or R23 as to find durable materials at low temperature to make the unit), chilled cold part to its boiling point- 220K (190K), I could have turned the heat of the atmosphere at a temperature of 260 - 270K into mechanical energy. I will have available some 40-50 (70-80) degrees temperature difference between the hot and cold part that will allow me to convert heat from the atmosphere into mechanical energy.This will not eject CO2 - I'll need energy just to cool the cold part of the unit initially.