simplest solution / Passive microclimate control systems / external energy source / by-product / gas content / active systems / wet media / passive systems / chemical change / active and passive microclimate control systems / gas filters / laboratory systems / compressed gas refrigeration system / treatment device / on board electronics / active microclimate systems / absorbent media / past misting devices / passive media / gas systems / radiant energy / regular media replacement / energy / passive and active systems microclimate control systems / /