The Eden project consists of two massive 'biomes' situated at the bottom of a former clay pit in Cornwall, UK. They mimic a 'humid-tropic' and a 'warm-temperate' environment and each houses a wealth of plant life. The aim is to let plants grow naturally in a climate designed to mirror nature as closely as possible. A Horticultural Management System monitors temperature conditions and there is a separate humidity control system. There are 24 Moducel air handling units in the humid tropics biome.