Donley County, TX Insulation Payback
Donley County, TX: what topping up your attic actually costs
Donley County sits in IECC climate zone 4 (Mixed-Dry) — a wide swing between a hot dry summer and a cold winter. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.7 years at an estimated $1,306/year saved. That's about as fast as attic paybacks get.
Heating vs. cooling in Donley County
The estimated savings split roughly $1,025/year heating, $281/year cooling. Out of every 100 US counties tracked here, Donley County's savings potential beats roughly 39 of them. Within zone 4 specifically, it ranks 571st of 825 counties by estimated savings. Texas averages $1,035/year across the counties tracked here; Donley County comes in 26% higher.
Where these numbers come from
The heating and cooling degree days behind this estimate — 3,833 HDD and 1,748 CDD (base 65°F, 1991-2020 normals) — come from CLARENDON, TX US, the nearest NOAA station with published normals, 4.5 miles from Donley County's center. By total degree days, Donley County sits at the 42th percentile nationally. Donley 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
If Donley County's attic already has 3-4 inches of old insulation (about R-11) rather than bare joists, the recommended target drops to R-49. That smaller top-up costs around $2,280 and saves an estimated $190/year — payback about 12 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 Donley County's estimated $1,306/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-60 is the target here specifically.