Illinois: Attic Insulation Payback by County

Illinois: 100 counties covered

Illinois spans DOE climate zones 4, 5. Across its 100 counties tracked here, an uninsulated attic saves an estimated $1,642/year on average once topped up to the recommended R-value — actual savings depend on each county's own heating and cooling degree days, shown below.

• Jo Daviess County — zone 5, ~$1,981/yr
• Stephenson County — zone 5, ~$1,971/yr
• Boone County — zone 5, ~$1,941/yr
• DeKalb County — zone 5, ~$1,930/yr
• Lee County — zone 5, ~$1,928/yr
• Carroll County — zone 5, ~$1,920/yr
• Whiteside County — zone 5, ~$1,917/yr
• Winnebago County — zone 5, ~$1,872/yr
• McHenry County — zone 5, ~$1,867/yr
• DuPage County — zone 5, ~$1,864/yr
• Ogle County — zone 5, ~$1,857/yr
• Bureau County — zone 5, ~$1,850/yr
• Kendall County — zone 5, ~$1,846/yr
• Stark County — zone 5, ~$1,846/yr
• Lake County — zone 5, ~$1,832/yr
• Mercer County — zone 5, ~$1,829/yr
• Henry County — zone 5, ~$1,807/yr
• Grundy County — zone 5, ~$1,802/yr
• Knox County — zone 5, ~$1,800/yr
• LaSalle County — zone 5, ~$1,800/yr
• Will County — zone 5, ~$1,790/yr
• Rock Island County — zone 5, ~$1,778/yr
• Ford County — zone 5, ~$1,775/yr
• Warren County — zone 5, ~$1,774/yr
• McLean County — zone 5, ~$1,768/yr
• Iroquois County — zone 5, ~$1,760/yr
• Kankakee County — zone 5, ~$1,760/yr
• Cook County — zone 5, ~$1,748/yr
• Henderson County — zone 5, ~$1,743/yr
• McDonough County — zone 5, ~$1,737/yr
• Livingston County — zone 5, ~$1,730/yr
• Putnam County — zone 5, ~$1,721/yr
• Edgar County — zone 5, ~$1,714/yr
• Woodford County — zone 5, ~$1,709/yr
• Fulton County — zone 5, ~$1,707/yr
• Mason County — zone 5, ~$1,707/yr
• Schuyler County — zone 5, ~$1,707/yr
• Piatt County — zone 5, ~$1,698/yr
• Peoria County — zone 5, ~$1,687/yr
• Tazewell County — zone 5, ~$1,687/yr
• Champaign County — zone 5, ~$1,685/yr
• Hancock County — zone 5, ~$1,683/yr
• Douglas County — zone 5, ~$1,680/yr
• Marshall County — zone 5, ~$1,680/yr
• Menard County — zone 5, ~$1,679/yr
• Logan County — zone 5, ~$1,667/yr
• Adams County — zone 5, ~$1,652/yr
• Scott County — zone 5, ~$1,648/yr
• Cass County — zone 5, ~$1,645/yr
• Morgan County — zone 5, ~$1,645/yr
• Greene County — zone 5, ~$1,642/yr
• Moultrie County — zone 5, ~$1,638/yr
• Macon County — zone 5, ~$1,635/yr
• Sangamon County — zone 5, ~$1,634/yr
• Brown County — zone 5, ~$1,633/yr
• Pike County — zone 5, ~$1,618/yr
• Christian County — zone 4, ~$1,617/yr
• Jersey County — zone 5, ~$1,615/yr
• Shelby County — zone 4, ~$1,613/yr
• Macoupin County — zone 4, ~$1,606/yr
• Vermilion County — zone 5, ~$1,606/yr
• Crawford County — zone 4, ~$1,583/yr
• Clark County — zone 5, ~$1,580/yr
• Cumberland County — zone 5, ~$1,580/yr
• Effingham County — zone 4, ~$1,579/yr
• Calhoun County — zone 5, ~$1,560/yr
• Richland County — zone 4, ~$1,556/yr
• Fayette County — zone 4, ~$1,554/yr
• Marion County — zone 4, ~$1,546/yr
• Jasper County — zone 4, ~$1,545/yr
• Clay County — zone 4, ~$1,534/yr
• Coles County — zone 5, ~$1,533/yr
• Jefferson County — zone 4, ~$1,528/yr
• Lawrence County — zone 4, ~$1,525/yr
• Bond County — zone 4, ~$1,509/yr
• Clinton County — zone 4, ~$1,509/yr
• Washington County — zone 4, ~$1,509/yr
• Madison County — zone 4, ~$1,507/yr
• Montgomery County — zone 4, ~$1,506/yr
• White County — zone 4, ~$1,499/yr
• Randolph County — zone 4, ~$1,492/yr
• Hamilton County — zone 4, ~$1,479/yr
• Monroe County — zone 4, ~$1,474/yr
• Edwards County — zone 4, ~$1,469/yr
• Hardin County — zone 4, ~$1,466/yr
• Williamson County — zone 4, ~$1,455/yr
• Wabash County — zone 4, ~$1,449/yr
• Franklin County — zone 4, ~$1,442/yr
• Perry County — zone 4, ~$1,434/yr
• Wayne County — zone 4, ~$1,424/yr
• Jackson County — zone 4, ~$1,413/yr
• Gallatin County — zone 4, ~$1,400/yr
• Saline County — zone 4, ~$1,394/yr
• Massac County — zone 4, ~$1,379/yr
• St. Clair County — zone 4, ~$1,379/yr
• Alexander County — zone 4, ~$1,368/yr
• Johnson County — zone 4, ~$1,348/yr
• Pope County — zone 4, ~$1,348/yr
• Pulaski County — zone 4, ~$1,345/yr
• Union County — zone 4, ~$1,326/yr