Sarpy County, NE Insulation Payback
Is attic insulation worth it in Sarpy County, NE?
Sarpy County sits in IECC climate zone 5 (Cold) — cold enough that heating, not cooling, is what decides the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 $1,828 a year in heating and cooling — a payback around 1.9 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,660/year of that and cooling about $168/year — Sarpy County needs both. Nationally, Sarpy County ranks in the 74th percentile for insulation savings potential. Compared only against its own climate zone, Sarpy County places 250th out of 745. Against Nebraska's own average of $1,872/year, Sarpy County runs 2% below that.
The climate data behind this
Sarpy County's climate figures — 6,209 heating and 1,044 cooling degree days a year — are read from GRETNA 4NE, NE US, 5.3 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Sarpy County 766th nationally by total degree days — the 76th 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.
The smaller top-up scenario
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 $267/year saved (~8.6-year payback). Whether that is worth it depends on how long you plan to stay.
Getting it done in Sarpy County
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 Sarpy County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Sarpy County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Sarpy 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.