Providing an interactive website featuring technology that enables users to monitor and manage HVAC systems; engineering consultation services in the field of HVAC efficiency; providing online non-downloadable computer software for use in monitoring and managing HVAC systems; providing economic analyses of HVAC systems; providing online ordering services relating to HVAC equipment, parts, and services; providing graphical user interface software for use in monitoring and managing HVAC systems; and electronic monitoring equipment for HVAC systems to provide energy management information; software used to monitor HVAC systems; computer application software for mobile devices used to monitor HVAC systems and communicate HVAC system information; downloadable software for monitoring and managing HVAC systems; downloadable computer software for use in monitoring and managing HVAC systems; downloadable software providing graphical user interfaces for use in monitoring and managing HVAC systems; and providing online ordering services relating to HVAC systems, equipment, parts, and servicing; providing online pricing information concerning HVAC systems, equipment, parts, and services; and providing installation and repair services for HVAC equipment; and providing financial consultancy services in the field of HVAC system and equipment efficiency; providing financial consultancy services in the field of comparing the efficiency of HVAC systems and equipment