Jefferson County, KS Insulation Payback
Is attic insulation worth it in Jefferson County, KS?
Jefferson County, Kansas is zone 4 under DOE's climate map (Mixed-Humid), which means heating load in winter and cooling load in summer, both worth taking seriously here. 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 $1,612 a year — payback in roughly 2.2 years. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $1,389/year of that and cooling about $224/year — Jefferson County needs both. Nationally, Jefferson County ranks in the 60th percentile for insulation savings potential. Compared only against its own climate zone, Jefferson County places 41st out of 825. Against Kansas's own average of $1,594/year, Jefferson County runs 1% above that.
Jefferson County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 5,193 HDD and 1,394 CDD (base 65°F, 1991-2020 normals) — come from OSKALOOSA 4 NE, KS US, the nearest NOAA station with published normals, 5.5 miles from Jefferson County's center. By total degree days, Jefferson County sits at the 64th percentile nationally. 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.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $235/year saved — roughly 9.7 years to break even. Whether that is worth it depends on how long you plan to stay.
Next steps for a Jefferson 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 Jefferson County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Jefferson County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Jefferson 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.