Ketchikan Gateway Borough, AK Insulation Payback
Ketchikan Gateway Borough, AK: what topping up your attic actually costs
Ketchikan Gateway Borough sits in IECC climate zone 7 (Very Cold) — winters long and harsh enough that heating is essentially the entire equation. 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 $1,737 a year — payback in roughly 2 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,732/year heating, $5/year cooling. Out of every 100 US counties tracked here, Ketchikan Gateway Borough's savings potential beats roughly 68 of them. Within zone 7 specifically, it ranks 120th of 120 counties by estimated savings. Alaska averages $2,854/year across the counties tracked here; Ketchikan Gateway Borough comes in 39% lower.
Ketchikan Gateway Borough's actual weather, not a national average
The heating and cooling degree days behind this estimate — 6,476 HDD and 32 CDD (base 65°F, 1991-2020 normals) — come from BEAVER FALLS, AK US, the nearest NOAA station with published normals, 24 miles from Ketchikan Gateway Borough's center. By total degree days, Ketchikan Gateway Borough sits at the 62th percentile nationally.
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 $253/year saved (~9-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in Ketchikan Gateway 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 Ketchikan Gateway Borough 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.