Jefferson County, NE Insulation Payback
Jefferson County, NE: what topping up your attic actually costs
Jefferson County, Nebraska is zone 5 under DOE's climate map (Cold), which means a real winter that drives most of the annual energy bill here. An uninsulated attic there should be built up to R-60. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2 years at an estimated $1,772/year saved. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,595/year heating, $177/year cooling. Out of every 100 US counties tracked here, Jefferson County's savings potential beats roughly 70 of them. Within zone 5 specifically, it ranks 354th of 745 counties by estimated savings. Nebraska averages $1,872/year across the counties tracked here; Jefferson County comes in 5% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 5,966 HDD and 1,102 CDD (base 65°F, 1991-2020 normals) — come from FAIRBURY 5S, NE US, the nearest NOAA station with published normals, 7.1 miles from Jefferson County's center. Combined heating and cooling load puts Jefferson County in the 73th percentile of this 3,162-county dataset. Jefferson County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
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 $259/year saved (~8.8-year payback). This one is a genuine toss-up, not a clear yes.
Next steps for a Jefferson County attic
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Jefferson County's estimated $1,772/year on the line.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.