Phelps County, MO Insulation Payback
Attic insulation payback for Phelps County, MO
DOE classifies Phelps County as climate zone 4, mixed-humid — a genuine mix of cold winters and humid summers, with neither one dominating the bill. Its recommended attic R-value for bare joists is 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 $1,472/year saved. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,233/year comes from reduced heating and $239/year from reduced cooling load through the ceiling. Phelps County beats 51% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Phelps County ranks 228th. Against Missouri's own average of $1,534/year, Phelps County runs 4% below that.
The climate data behind this
Phelps County's climate figures — 4,612 heating and 1,487 cooling degree days a year — are read from ROLLA MISSOURI S&T, MO US, 6.3 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Phelps County 1456th nationally by total degree days — the 54th percentile. DOE also classifies Phelps County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
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 $215/year saved (~10.6-year payback). It is close - the payback only just fits a reasonable timeframe.
Quotes and materials for this job
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 Phelps County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.