1. A system for managing energy consumption of a building system at a first location, said system comprising: a source of actual energy consumption data; a source of actual weather data; a database correlating discrete weather data values with expected energy consumption values for at least one component of the building system; and at least one computer accessing said actual weather data, said actual energy consumption data and said database, wherein said at least one computer compares said expected energy consumption values with said actual energy consumption data and generates an output based on said comparison.