Thermostat savings are based on the U.S. Department of Energy estimation that a residential heating bill can be reduced “as much as 1% for each degree if the setback period is eight hours long.”

Natural gas consumption and NOX emissions were focused on the average Utah household during winter months, from December 1 to February 28. It was assumed that an average of 54% of annual household natural gas use in Utah occurs during winter months. Additional home heating sources include:

Carpool and transit savings are based on formulas used by Clear the Air Challenge. Smog rating information was obtained from the U.S. Environmental Protection Agency. Vehicle idling information was obtained from Utah Clean Cities. The U.S. Census was referenced for number of employed Utahns who get to work by driving alone in a vehicle.