Roosevelt County, MT Insulation Payback
Is attic insulation worth it in Roosevelt County, MT?
Roosevelt County sits in IECC climate zone 6 (Cold) — winters that dominate the energy bill, with cooling a minor factor. 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 $2,516 a year — payback in roughly 1.4 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $2,463/year of that and cooling about $53/year — Roosevelt County needs both. Nationally, Roosevelt County ranks in the 97th percentile for insulation savings potential. Compared only against its own climate zone, Roosevelt County places 10th out of 459. Against Montana's own average of $2,182/year, Roosevelt County runs 15% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 9,210 HDD and 331 CDD (base 65°F, 1991-2020 normals) — come from WOLF POINT 29 ENE, MT US, the nearest NOAA station with published normals, 5.2 miles from Roosevelt County's center. That combined heating-and-cooling load ranks Roosevelt County 81st nationally by total degree days — the 97th 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
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $367/year saved — roughly 6.2 years to break even. The math clears comfortably within a normal ownership horizon.
Getting it done in Roosevelt 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 Roosevelt County's estimated $2,516/year on the line.
Roosevelt County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Roosevelt 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.