Garvin County, OK Insulation Payback
Garvin County, OK: what topping up your attic actually costs
DOE classifies Garvin County as climate zone 3, mixed-humid — real heating and real cooling seasons both, roughly balanced across the year. Its recommended attic R-value for bare joists is R-49. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-49 runs an estimated $2,820, and saves about $1,218 a year in heating and cooling — a payback around 2.3 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $885/year heating, $334/year cooling. Out of every 100 US counties tracked here, Garvin County's savings potential beats roughly 32 of them. Within zone 3 specifically, it ranks 76th of 690 counties by estimated savings. Oklahoma averages $1,260/year across the counties tracked here; Garvin County comes in 3% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 3,334 HDD and 2,095 CDD (base 65°F, 1991-2020 normals) — come from PAULS VALLEY 4 WSW, OK US, the nearest NOAA station with published normals, 2.1 miles from Garvin County's center. That combined heating-and-cooling load ranks Garvin County 1960th nationally by total degree days — the 38th percentile. Garvin County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
The smaller top-up scenario
If Garvin County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-38. That smaller top-up costs around $1,620 and saves an estimated $164/year — payback about 9.9 years. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Garvin County's estimated $1,218/year on the line.
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-49 is the target here specifically.