Dakota County, NE Insulation Payback
Dakota County attic insulation, by the numbers
Dakota County, Nebraska is zone 5 under DOE's climate map (Cold), which means winters that dominate the energy bill, with cooling a minor factor. An uninsulated attic there should be built up to 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 $1,973 a year — payback in roughly 1.8 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,834 a year on the heating side, $139 on cooling. By estimated insulation savings, Dakota County lands in the 81th percentile nationally. Zone 5 alone covers 745 counties in this dataset, and Dakota County comes in 68th by savings. Nebraska averages $1,872/year across the counties tracked here; Dakota County comes in 5% higher.
Dakota County's actual weather, not a national average
NOAA's SIOUX CITY GATEWAY AP, IA US station, 9.3 miles from Dakota County, supplies the 6,860 HDD and 866 CDD this estimate runs on. That combined heating-and-cooling load ranks Dakota County 556th nationally by total degree days — the 82th percentile. One local detail the R-value alone won't tell you: Dakota County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
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 $288/year saved (~7.9-year payback). Worth doing on the numbers alone.
Getting it done in Dakota 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 Dakota County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Dakota County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.