This title presents an updated version of a study carried out by BSRIA in 1987 of the relative costs of alternative wet and dry condenser cooling systems serving the chillers of an air conditioned office building. Since then, more specific water treatment and maintenance requirements for cooling towers have been published to minimise the risk of an outbreak of Legionnaires' disease, and this has modified the cost assessment. This book revises the original case study capital and running costs to late 1989 prices and assesses the current water treatment and maintenance costs. It also states that the revised assessment of overall costs shows that up to a cooling load capacity of 1200kW the packaged air cooled chiller option is cheaper than a cooling tower or dry cooler system with separate chillers. The cooling tower system however requires the least roof space.