Washington: Attic Insulation Payback by County

Washington: 38 counties covered

Washington spans DOE climate zones 4, 5, 6. Across its 38 counties tracked here, an uninsulated attic saves an estimated $1,583/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.

• Ferry County — zone 6, ~$2,130/yr
• Pend Oreille County — zone 6, ~$2,041/yr
• Chelan County — zone 5, ~$1,962/yr
• Stevens County — zone 6, ~$1,931/yr
• Lincoln County — zone 5, ~$1,856/yr
• Klickitat County — zone 5, ~$1,785/yr
• Okanogan County — zone 6, ~$1,765/yr
• Douglas County — zone 5, ~$1,719/yr
• Skamania County — zone 5, ~$1,715/yr
• Spokane County — zone 5, ~$1,691/yr
• Kittitas County — zone 5, ~$1,688/yr
• Whitman County — zone 5, ~$1,687/yr
• Grant County — zone 5, ~$1,674/yr
• Garfield County — zone 5, ~$1,649/yr
• Adams County — zone 5, ~$1,628/yr
• Clallam County — zone 4, ~$1,619/yr
• Jefferson County — zone 4, ~$1,619/yr
• Columbia County — zone 5, ~$1,594/yr
• Franklin County — zone 5, ~$1,555/yr
• Benton County — zone 5, ~$1,518/yr
• Yakima County — zone 5, ~$1,507/yr
• Pacific County — zone 4, ~$1,497/yr
• Asotin County — zone 5, ~$1,478/yr
• Pierce County — zone 4, ~$1,462/yr
• Thurston County — zone 4, ~$1,456/yr
• Island County — zone 4, ~$1,448/yr
• Skagit County — zone 4, ~$1,446/yr
• Clark County — zone 4, ~$1,444/yr
• Walla Walla County — zone 5, ~$1,433/yr
• Lewis County — zone 4, ~$1,398/yr
• San Juan County — zone 4, ~$1,388/yr
• Mason County — zone 4, ~$1,385/yr
• Snohomish County — zone 4, ~$1,367/yr
• King County — zone 4, ~$1,359/yr
• Wahkiakum County — zone 4, ~$1,351/yr
• Grays Harbor County — zone 4, ~$1,350/yr
• Kitsap County — zone 4, ~$1,321/yr
• Cowlitz County — zone 4, ~$1,254/yr