Wyandotte County, KS Insulation Payback
Wyandotte County, KS: what topping up your attic actually costs
DOE classifies Wyandotte County as climate zone 4, mixed-humid — heating load in winter and cooling load in summer, both worth taking seriously here. Its recommended attic R-value for bare joists is 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 $1,630 a year — payback in roughly 2.1 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Wyandotte County
The estimated savings split roughly $1,433/year heating, $197/year cooling. Out of every 100 US counties tracked here, Wyandotte County's savings potential beats roughly 62 of them. Within zone 4 specifically, it ranks 24th of 825 counties by estimated savings. Kansas averages $1,594/year across the counties tracked here; Wyandotte County comes in 2% higher.
The climate data behind this
Wyandotte County's climate figures — 5,358 heating and 1,226 cooling degree days a year — are read from BONNER SPRINGS, KS US, 8 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Wyandotte County 1156th nationally by total degree days — the 63th percentile. Wyandotte County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
If Wyandotte County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $238/year — payback about 9.6 years. This one is a genuine toss-up, not a clear yes.
Getting it done in Wyandotte County
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 Wyandotte County's estimated $1,630/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.