Carbon County, MT Insulation Payback
Attic insulation payback for Carbon County, MT
Carbon County sits in IECC climate zone 6 (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. 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 $2,049 a year — payback in roughly 1.7 years. Hard to find a home improvement with a faster payback than this.
Heating vs. cooling in Carbon County
Of that, about $1,982/year comes from reduced heating and $66/year from reduced cooling load through the ceiling. Carbon County beats 84% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 459 counties DOE places in zone 6, Carbon County ranks 351st. Against Montana's own average of $2,182/year, Carbon County runs 6% below that.
The climate data behind this
Carbon County's climate figures — 7,414 heating and 414 cooling degree days a year — are read from BRIDGER 2 N, MT US, 9.1 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Carbon County sits at the 84th percentile nationally. DOE also classifies Carbon County as moisture regime B (dry) - 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 $299/year saved (~7.6-year payback). Topping up the attic pays for itself here.
Getting it done in Carbon 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 Carbon County's estimated $2,049/year on the line.
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.