Caroline County, MD Insulation Payback
Attic insulation payback for Caroline County, MD
Caroline County sits in IECC climate zone 4 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously here. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,410 a year — payback in roughly 2.5 years. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Caroline County
Of that, about $1,228/year comes from reduced heating and $182/year from reduced cooling load through the ceiling. Caroline County beats 46% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Caroline County ranks 368th. Against Maryland's own average of $1,395/year, Caroline County runs 1% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 4,592 HDD and 1,135 CDD (base 65°F, 1991-2020 normals) — come from GREENWOOD 2NE, DE US, the nearest NOAA station with published normals, 14.3 miles from Caroline County's center. That combined heating-and-cooling load ranks Caroline County 1729th nationally by total degree days — the 45th percentile. DOE also classifies Caroline County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
If the attic isn't bare
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $206/year saved (~11.1-year payback). It is close - the payback only just fits a reasonable timeframe.
Quotes and materials for this job
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Caroline County's estimated $1,410/year on the line.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.