A study was conducted to assess the effects of a new class scheduling system at Harford Community College (HCC), which substituted 75-minute classes twice a week and 150-minute classes once a week for regular three 50-minute classes in order to save energy by reducing student travel to college. The study sought to determine the effects of these changes on credit generation and on students' work schedules, free time and participation in college activities; students' preferences for the new or old scheduling systems; and faculty perceptions of the pedagogical and logistical effects of these changes. Analysis of student records, a survey of the opinions of 280 of 1,732 returning or re-entry day students, and survey responses from 49 of 100 faculty members indicated that: (1) average student credit load fell 1% after the change; (2) the mean number of student trips per week to campus fell from 3.79 to 3.42; (3) both students and faculty indicated a preference for 75-minute classes twice a week and over half of the faculty respondents considered this schedule to be academically superior; (4) 51% of the students preferred the new schedule to the old, while 31% did not favor the new system; and (5) the majority of the student respondents felt that their work schedule, free time, and extracurricular activities were enhanced or were unaffected by the new schedule. (HB)