Shelby County, MO Insulation Payback
Shelby County attic insulation, by the numbers
Shelby County sits in IECC climate zone 5 (Cold) — a real winter that drives most of the annual energy bill here. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 2.1 years at an estimated $1,666/year saved. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $1,490 a year on the heating side, $175 on cooling. By estimated insulation savings, Shelby County lands in the 64th percentile nationally. Zone 5 alone covers 745 counties in this dataset, and Shelby County comes in 542nd by savings. Missouri averages $1,534/year across the counties tracked here; Shelby County comes in 9% higher.
The climate data behind this
Shelby County's climate figures — 5,573 heating and 1,092 cooling degree days a year — are read from SHELBINA, MO US, 8.2 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Shelby County 1103rd nationally by total degree days — the 65th percentile. One local detail the R-value alone won't tell you: Shelby County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
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 $243/year saved — roughly 9.4 years to break even. Call this borderline rather than a clear win.
Getting it done in Shelby County
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 Shelby County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Shelby County's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.