Maryland: Attic Insulation Payback by County

Maryland: 23 counties covered

Maryland spans DOE climate zones 4, 5. Across its 23 counties tracked here, an uninsulated attic saves an estimated $1,395/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.

• Garrett County — zone 5, ~$1,834/yr
• Carroll County — zone 4, ~$1,588/yr
• Allegany County — zone 4, ~$1,536/yr
• Washington County — zone 4, ~$1,517/yr
• Harford County — zone 4, ~$1,446/yr
• Cecil County — zone 4, ~$1,426/yr
• Kent County — zone 4, ~$1,422/yr
• Prince George's County — zone 4, ~$1,422/yr
• Queen Anne's County — zone 4, ~$1,422/yr
• Caroline County — zone 4, ~$1,410/yr
• Montgomery County — zone 4, ~$1,397/yr
• Calvert County — zone 4, ~$1,392/yr
• Baltimore County — zone 4, ~$1,387/yr
• Frederick County — zone 4, ~$1,367/yr
• Charles County — zone 4, ~$1,313/yr
• Baltimore city — zone 4, ~$1,312/yr
• Anne Arundel County — zone 4, ~$1,300/yr
• Talbot County — zone 4, ~$1,299/yr
• Dorchester County — zone 4, ~$1,280/yr
• Somerset County — zone 4, ~$1,276/yr
• St. Mary's County — zone 4, ~$1,271/yr
• Wicomico County — zone 4, ~$1,247/yr
• Worcester County — zone 4, ~$1,226/yr