There are also some simplified tools available, with which a homeowner can quickly assess energy improvement potential. Often these are supplied for free by state agencies or local utilities, who produce a report with estimates of usage by device/area (since they have usage information already).
Various straightforward tools are accessible for homeowners to assess the potential for energy improvements efficiently. Often these are supplied without cost by state agencies or local utilities, who create reports that estimate usage based on devices and areas (as they have existing usage information).