McCone County, MT Insulation Payback
Is attic insulation worth it in McCone County, MT?
McCone County, Montana is zone 6 under DOE's climate map (Cold), which means cold enough that heating, not cooling, is what decides the bill. An uninsulated attic there should be built 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 1.6 years at an estimated $2,191/year saved. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $2,094/year of that and cooling about $97/year — McCone County needs both. Nationally, McCone County ranks in the 90th percentile for insulation savings potential. Compared only against its own climate zone, McCone County places 195th out of 459. Against Montana's own average of $2,182/year, McCone County runs 0% above that.
McCone County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 7,832 HDD and 601 CDD (base 65°F, 1991-2020 normals) — come from CIRCLE, MT US, the nearest NOAA station with published normals, 16.8 miles from McCone County's center. That combined heating-and-cooling load ranks McCone County 307th nationally by total degree days — the 90th percentile. Its moisture regime is classified dry, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
The smaller top-up scenario
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 $320/year saved (~7.1-year payback). The math clears comfortably within a normal ownership horizon.
Getting it done in McCone 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 McCone County, not a bid - contractors typically charge a $600 minimum regardless of job size.
McCone County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed McCone County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.