Rock County, NE Insulation Payback
Attic insulation payback for Rock County, NE
DOE classifies Rock County as climate zone 5, cold — cold enough that heating, not cooling, is what decides the bill. Its recommended attic R-value for bare joists is 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 $2,071 a year — payback in roughly 1.7 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $1,960/year comes from reduced heating and $111/year from reduced cooling load through the ceiling. Rock County beats 85% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Rock County ranks 17th. Against Nebraska's own average of $1,872/year, Rock County runs 11% above that.
The climate data behind this
The heating and cooling degree days behind this estimate — 7,330 HDD and 689 CDD (base 65°F, 1991-2020 normals) — come from NEWPORT, NE US, the nearest NOAA station with published normals, 14.9 miles from Rock County's center. Combined heating and cooling load puts Rock County in the 86th percentile of this 3,162-county dataset. DOE also classifies Rock 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 $302/year saved (~7.5-year payback). Topping up the attic pays for itself here.
Next steps for a Rock 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 Rock County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.