Northwest Arctic Borough, AK Insulation Payback
Northwest Arctic Borough attic insulation, by the numbers
DOE classifies Northwest Arctic Borough as climate zone 8, subarctic — winters severe enough to sit in DOE's most extreme US climate category. Its recommended attic R-value for bare joists is 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 $3,987 a year — payback in roughly 0.9 years. Topping up the attic pays for itself fast here.
The breakdown behind the number
Split it out and it's roughly $3,986 a year on the heating side, $1 on cooling. By estimated insulation savings, Northwest Arctic Borough lands in the 100th percentile nationally. Zone 8 alone covers 9 counties in this dataset, and Northwest Arctic Borough comes in 2nd by savings. Alaska averages $2,854/year across the counties tracked here; Northwest Arctic Borough comes in 40% higher.
The climate data behind this
The heating and cooling degree days behind this estimate — 14,907 HDD and 5 CDD (base 65°F, 1991-2020 normals) — come from KOTZEBUE RALPH WEIN AP, AK US, the nearest NOAA station with published normals, 71.3 miles from Northwest Arctic Borough's center. Combined heating and cooling load puts Northwest Arctic Borough in the 100th percentile of this 3,162-county dataset.
Already have some insulation?
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 $582/year saved (~3.9-year payback). Worth doing on the numbers alone.
Getting it done in Northwest Arctic Borough
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 Northwest Arctic Borough job, not a quote. Expect at least a $600 minimum charge from most contractors.
Where these figures come from
Northwest Arctic Borough's R-60 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-60 is the target here specifically.