Tulsa County, OK Insulation Payback
Tulsa County, OK: what topping up your attic actually costs
DOE classifies Tulsa County as climate zone 3, mixed-humid — a genuine mix of cold winters and humid summers, with neither one dominating the bill. Its recommended attic R-value for bare joists is R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.3 years at an estimated $1,237/year saved. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $895/year heating, $342/year cooling. Out of every 100 US counties tracked here, Tulsa County's savings potential beats roughly 34 of them. Within zone 3 specifically, it ranks 59th of 690 counties by estimated savings. Oklahoma averages $1,260/year across the counties tracked here; Tulsa County comes in 2% lower.
The climate data behind this
NOAA's TULSA R L JONES JR AP, OK US station, 6.1 miles from Tulsa County, supplies the 3,374 HDD and 2,146 CDD this estimate runs on. That combined heating-and-cooling load ranks Tulsa County 1886th nationally by total degree days — the 40th percentile. Tulsa 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
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $167/year saved — roughly 9.7 years to break even. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $2,820 as a starting estimate for a Tulsa County 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-49 is the target here specifically.