Matanuska-Susitna Borough, AK Insulation Payback
Matanuska-Susitna Borough attic insulation, by the numbers
Matanuska-Susitna Borough 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 $2,835 a year — payback in roughly 1.2 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Matanuska-Susitna Borough
Split it out and it's roughly $2,832 a year on the heating side, $3 on cooling. By estimated insulation savings, Matanuska-Susitna Borough lands in the 99th percentile nationally. Zone 7 alone covers 120 counties in this dataset, and Matanuska-Susitna Borough comes in 11th by savings. Alaska averages $2,854/year across the counties tracked here; Matanuska-Susitna Borough comes in 1% lower.
The climate data behind this
The heating and cooling degree days behind this estimate — 10,592 HDD and 17 CDD (base 65°F, 1991-2020 normals) — come from TALKEETNA AP, AK US, the nearest NOAA station with published normals, 19.4 miles from Matanuska-Susitna Borough's center. By total degree days, Matanuska-Susitna Borough sits at the 99th percentile nationally.
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 $414/year saved — roughly 5.5 years to break even. Worth doing on the numbers alone.
Getting it done in Matanuska-Susitna Borough
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 Matanuska-Susitna Borough, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Matanuska-Susitna 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.