Greenwood County, KS Insulation Payback
Is attic insulation worth it in Greenwood County, KS?
Greenwood County sits in IECC climate zone 4 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously here. 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 $1,531 a year in heating and cooling — a payback around 2.3 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $1,308/year of that and cooling about $224/year — Greenwood County needs both. Nationally, Greenwood County ranks in the 55th percentile for insulation savings potential. Compared only against its own climate zone, Greenwood County places 133rd out of 825. Against Kansas's own average of $1,594/year, Greenwood County runs 4% below that.
Greenwood County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 4,890 HDD and 1,392 CDD (base 65°F, 1991-2020 normals) — come from EUREKA 1E, KS US, the nearest NOAA station with published normals, 3.9 miles from Greenwood County's center. Combined heating and cooling load puts Greenwood County in the 58th percentile of this 3,162-county dataset. 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.
Already have some insulation?
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 $223/year saved (~10.2-year payback). Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
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 Greenwood County's estimated $1,531/year on the line.
Greenwood County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Greenwood 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.