El Paso County, TX Insulation Payback
El Paso County attic insulation, by the numbers
DOE classifies El Paso County as climate zone 3, hot-dry — desert-dry heat for much of the year, with the attic taking the brunt of it. 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 $1,010 a year in heating and cooling — a payback around 2.8 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in El Paso County
Split it out and it's roughly $585 a year on the heating side, $424 on cooling. By estimated insulation savings, El Paso County lands in the 17th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and El Paso County comes in 449th by savings. Texas averages $1,035/year across the counties tracked here; El Paso County comes in 2% lower.
El Paso County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 2,206 HDD and 2,662 CDD (base 65°F, 1991-2020 normals) — come from EL PASO INTL AP, TX US, the nearest NOAA station with published normals, 8.5 miles from El Paso County's center. Combined heating and cooling load puts El Paso County in the 22th percentile of this 3,162-county dataset. One local detail the R-value alone won't tell you: El Paso County sits in moisture regime B (dry), which can affect the vapor-barrier choice.
Already have some insulation?
If El Paso 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 $136/year — payback about 11.9 years. Call this borderline rather than a clear win.
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 El Paso County's estimated $1,010/year on the line.
Where these figures come from
El Paso County's R-49 target and its degree-day figures both come from named federal sources - see the methodology guide for exactly which ones. The guide to what R-value actually means explains why R-49 is the target here specifically.