Grant County, OR Insulation Payback
Grant County, OR: what topping up your attic actually costs
Grant County sits in IECC climate zone 5 (Cold) — cold enough that heating, not cooling, is what decides the bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,876 a year in heating and cooling — a payback around 1.9 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,836/year heating, $40/year cooling. Out of every 100 US counties tracked here, Grant County's savings potential beats roughly 77 of them. Within zone 5 specifically, it ranks 171st of 745 counties by estimated savings. Oregon averages $1,557/year across the counties tracked here; Grant County comes in 20% higher.
Where these numbers come from
NOAA's JOHN DAY, OR US station, 5.7 miles from Grant County, supplies the 6,866 HDD and 249 CDD this estimate runs on. That combined heating-and-cooling load ranks Grant County 834th nationally by total degree days — the 74th percentile. Grant County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
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 $274/year saved (~8.3-year payback). This one is a genuine toss-up, not a clear yes.
Next steps for a Grant County attic
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 Grant 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.