Harper County, KS Insulation Payback
Attic insulation payback for Harper County, KS
Harper County, Kansas is zone 4 under DOE's climate map (Mixed-Humid), which means real heating and real cooling seasons both, roughly balanced across the year. 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 2.4 years at an estimated $1,462/year saved. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Harper County
Of that, about $1,186/year comes from reduced heating and $275/year from reduced cooling load through the ceiling. Harper County beats 50% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Harper County ranks 254th. Against Kansas's own average of $1,594/year, Harper County runs 8% below that.
The climate data behind this
NOAA's ANTHONY, KS US station, 3.1 miles from Harper County, supplies the 4,436 HDD and 1,715 CDD this estimate runs on. By total degree days, Harper County sits at the 55th percentile nationally. DOE also classifies Harper 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
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 $213/year saved (~10.7-year payback). It is close - the payback only just fits a reasonable timeframe.
Getting it done in Harper County
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Harper County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.