The document discusses air conditioners and their energy efficiency parameters in buildings. It describes how air conditioners work and their adverse environmental effects, such as contributing to global warming and pollution. The document then discusses more energy efficient parameters for air conditioners like COP (coefficient of performance) and EER (energy efficiency ratio), which indicate how much cooling or heating is produced relative to the electrical input. It presents two new more efficient methods - using circulating cold or hot water through roof pipes, and using geothermal heating and cooling systems which transfer heat to and from the earth without burning fossil fuels. Geothermal systems can increase COP and EER up to 8-9 and use 25-50% less electricity while improving humidity control and