Campbell County, TN Insulation Payback
Is attic insulation worth it in Campbell County, TN?
Campbell County, Tennessee 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 $1,331 a year in heating and cooling — a payback around 2.6 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,159/year of that and cooling about $173/year — Campbell County needs both. Nationally, Campbell County ranks in the 41th percentile for insulation savings potential. Compared only against its own climate zone, Campbell County places 520th out of 825. Against Tennessee's own average of $1,258/year, Campbell County runs 6% above that.
Campbell County's actual weather, not a national average
NOAA's NEWCOMB, TN US station, 10.4 miles from Campbell County, supplies the 4,334 HDD and 1,074 CDD this estimate runs on. That combined heating-and-cooling load ranks Campbell County 1982nd nationally by total degree days — the 37th percentile. 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?
If Campbell County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $194/year — payback about 11.7 years. Whether that is worth it depends on how long you plan to stay.
Next steps for a Campbell County attic
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Campbell County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Campbell County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Campbell 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.