When reviewing an GUID-2043E09F-40E5-4155-AE28-134F62E54F54.htm#WS73099CC142F487552C60378B128B24194AD655E in the Results and Compare dialog, this chart displays the project's estimated fuel usage by month. If the project uses fuel for heating (as opposed to electric heating sources), fuel usage increases during the colder months of the year.