1. A system for efficient HVAC control comprising: an HVAC control device that is configured to control an HVAC system to condition an enclosure, the HVAC control device having a walk-up display that displays information to a user, the display including a first energy efficiency icon that is displayed in response to an on-device temperature change corresponding to an increased degree of responsible energy usage of the HVAC system in conditioning the enclosure, the first energy efficiency icon being displayed to present immediate feedback to the user about the responsible energy usage of the HVAC system; said HVAC control device being remotely controllable by a mobile device having software that is configured to: document an energy usage of the HVAC system for the enclosure during one or more historical periods; and display a second energy efficiency icon for a period of the one or more historical periods when the energy usage of the HVAC system for the period is representative of an environmentally responsible behavior in conditioning the enclosure; wherein said first and second energy efficiency icons are substantially visually identical in order to positively reinforce to the user the environmentally responsible behavior in conditioning the enclosure.