Johnson County, NE Insulation Payback
Attic insulation payback for Johnson County, NE
DOE classifies Johnson County as climate zone 5, cold — winters that dominate the energy bill, with cooling a minor factor. Its recommended attic R-value for bare joists is 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 $1,795 a year in heating and cooling — a payback around 1.9 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $1,618/year comes from reduced heating and $177/year from reduced cooling load through the ceiling. Johnson County beats 72% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Johnson County ranks 306th. Against Nebraska's own average of $1,872/year, Johnson County runs 4% below that.
The climate data behind this
NOAA's TECUMSEH 1S, NE US station, 4.7 miles from Johnson County, supplies the 6,053 HDD and 1,102 CDD this estimate runs on. Combined heating and cooling load puts Johnson County in the 74th percentile of this 3,162-county dataset. DOE also classifies Johnson County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $262/year saved — roughly 8.7 years to break even. It is close - the payback only just fits a reasonable timeframe.
Next steps for a Johnson 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 Johnson 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.