Protrade International offers well-proven and cost-effective hot water energy savings measures for commercial buildings in the Caribbean.  One noteworthy technique involves the use of heat exchangers  which capture heat from the high-temperature suction gas lines of air conditioning systems and re-directs it to water storage tanks, thus creating a source of “free” hot water heating.  Coupling this with solar circulating pumps can even approach a “zero operational carbon” system for hot water heating.  In other cases, solar hot water heating systems – long a staple in many Caribbean countries – can be a reliable hot water upgrade