Foster County, ND Insulation Payback
Foster County, ND: what topping up your attic actually costs
Foster County sits in IECC climate zone 7 (Very Cold) — a climate where the heating season stretches across most of the year. 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 $2,544 a year — payback in roughly 1.4 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Foster County
The estimated savings split roughly $2,476/year heating, $67/year cooling. Out of every 100 US counties tracked here, Foster County's savings potential beats roughly 98 of them. Within zone 7 specifically, it ranks 58th of 120 counties by estimated savings. North Dakota averages $2,496/year across the counties tracked here; Foster County comes in 2% higher.
The climate data behind this
NOAA's CARRINGTON 4 N, ND US station, 11.9 miles from Foster County, supplies the 9,262 HDD and 419 CDD this estimate runs on. That combined heating-and-cooling load ranks Foster County 66th nationally by total degree days — the 98th percentile.
If the attic isn't bare
If Foster 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 $371/year — payback about 6.1 years. That is a solid payback as home upgrades go.
Next steps for a Foster County attic
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Foster County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.