Lean construction is a way to design production systems to minimize waste of materials, time, and effort in order to produce additional value as much as possible. In principle, lean construction is identical to lean production in spirit.

Adiabatic cooling first was used in the Roman Empire 2000 years ago. People now are using water evaporation to cool down the surrounding air in all types of climate. Due to huge power consumption of cooling systems for building and data centres, engineers combine the ancient method with modern technologies to trade off the bill of energy