A field programmable or configurable thermostat for an HVAC system is provided. The configurable thermostat allows field programmability of service contact information, including name and contact telephone number information for the installer or service person. The system reminders and service intervals may be provided based upon calendar time or run time, and may be adjusted to particular periods by the service person in the field. Soft keys whose function is described on various changing menus allow service person to navigate through the various display and information entry screens. Scrolling or selection keys are used in one embodiment to vary the information on appropriate screens. Alternate embodiments utilize touch screens, alphanumeric keypads, etc., for the entry and editing of such information.