This brief presentation introduces the topic of the seminar - centralized vs decentralized heating and cooling. Major topics that will be addressed include: Background - History of centralized (district) energy systems. District Energy System Summary - Description of a district energy system along with its strengths and weaknesses. Decentralized System Summary - Description of a decentralized energy system along with its strengths and weaknesses. Current Trends - Briefly describe the current industry trends that is seeing some district energy systems being replaced with decentralized system.