A programmable thermostat time/temperature display has a continuous loop timeline with a plurality of temperature transition points along the timeline to define a plurality of timeline segments. Temperature and time IDs are displayable on the display and are associated with at least some of the timeline segments and temperature transition points. A thermostat can be programmed by touching a position on a touchscreen associated with a temperature transition point on a continuous loop timeline on the touchscreen. The touching step may be carried out by moving the first temperature transition point from a first position along the timeline to a second position along the timeline so to change the first timeline segment. An updated time ID may be selected for the first temperature transition point.