Prince George's County, MD Insulation Payback
Is attic insulation worth it in Prince George's County, MD?
Prince George's County, Maryland is zone 4 under DOE's climate map (Mixed-Humid), which means a genuine mix of cold winters and humid summers, with neither one dominating the bill. An uninsulated attic there should be built up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,422 a year in heating and cooling — a payback around 2.4 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Prince George's County
Heating accounts for about $1,216/year of that and cooling about $206/year — Prince George's County needs both. Nationally, Prince George's County ranks in the 47th percentile for insulation savings potential. Compared only against its own climate zone, Prince George's County places 341st out of 825. Against Maryland's own average of $1,395/year, Prince George's County runs 2% above that.
Where these numbers come from
NOAA's UPPER MARLBORO 3 NNW, MD US station, 4.6 miles from Prince George's County, supplies the 4,546 HDD and 1,284 CDD this estimate runs on. By total degree days, Prince George's County sits at the 48th percentile nationally. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $207/year saved — roughly 11 years to break even. Whether that is worth it depends on how long you plan to stay.
Next steps for a Prince George's County attic
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Prince George's County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Prince George's County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Prince George's County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.