This thermostat offers a “5-2” day temperature control program to separate weekday and weekend schedules. It comes preprogrammed with default settings provided by the EPA, so it is Energy Star approved. Features include rubber pushbuttons; an LCD; and a program schedule said to be retained in its memory indefinitely. The clock time is saved to memory every 10 min. Four wires are required for installation in an a/c application. Carrier Corp., ACLS Dept. 08TS-TA2, 108 Metropolitan Drive, Liverpool, NY 13088-5112; (Web site).