Sullivan County, MO Insulation Payback
Attic insulation payback for Sullivan County, MO
Sullivan County sits in IECC climate zone 5 (Cold) — cold enough that heating, not cooling, is what decides the bill. 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 1.9 years at an estimated $1,831/year saved. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,695/year comes from reduced heating and $136/year from reduced cooling load through the ceiling. Sullivan County beats 74% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Sullivan County ranks 241st. Against Missouri's own average of $1,534/year, Sullivan County runs 19% above that.
Where these numbers come from
Sullivan County's climate figures — 6,341 heating and 846 cooling degree days a year — are read from GREEN CITY 5N, MO US, 12.9 miles away, NOAA's nearest 1991-2020 normals station. Combined heating and cooling load puts Sullivan County in the 75th percentile of this 3,162-county dataset. DOE also classifies Sullivan County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
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 $267/year saved — roughly 8.5 years to break even. It is close - the payback only just fits a reasonable timeframe.
Quotes and materials for this job
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 Sullivan 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.