Dunn County, ND Insulation Payback
Dunn County, ND: what topping up your attic actually costs
Dunn County, North Dakota 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. 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 $2,460 a year — payback in roughly 1.4 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Dunn County
The estimated savings split roughly $2,397/year heating, $62/year cooling. Out of every 100 US counties tracked here, Dunn County's savings potential beats roughly 97 of them. Within zone 6 specifically, it ranks 19th of 459 counties by estimated savings. North Dakota averages $2,496/year across the counties tracked here; Dunn County comes in 1% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 8,965 HDD and 389 CDD (base 65°F, 1991-2020 normals) — come from DUNN CTR 1E, ND US, the nearest NOAA station with published normals, 1.3 miles from Dunn County's center. That combined heating-and-cooling load ranks Dunn County 103rd nationally by total degree days — the 97th percentile. Dunn County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
If Dunn 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 $359/year — payback about 6.4 years. That is a solid payback as home upgrades go.
Getting it done in Dunn 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 Dunn County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.