Broadwater County, MT Insulation Payback
Is attic insulation worth it in Broadwater County, MT?
Broadwater 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 1.7 years at an estimated $2,058/year saved. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $2,017/year of that and cooling about $41/year — Broadwater County needs both. Nationally, Broadwater County ranks in the 85th percentile for insulation savings potential. Compared only against its own climate zone, Broadwater County places 339th out of 459. Against Montana's own average of $2,182/year, Broadwater County runs 6% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 7,544 HDD and 253 CDD (base 65°F, 1991-2020 normals) — come from TOWNSEND 3SE, MT US, the nearest NOAA station with published normals, 3 miles from Broadwater County's center. By total degree days, Broadwater County sits at the 83th percentile nationally. 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.
If the attic isn't bare
If Broadwater County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $300/year — payback about 7.6 years. The math clears comfortably within a normal ownership horizon.
Getting it done in Broadwater 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 Broadwater County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Broadwater County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Broadwater 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.