Lamb County, TX Insulation Payback
Attic insulation payback for Lamb County, TX
Lamb 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 2.8 years at an estimated $1,245/year saved. Hard to find a home improvement with a faster payback than this.
The breakdown behind the number
Of that, about $1,009/year comes from reduced heating and $236/year from reduced cooling load through the ceiling. Lamb County beats 34% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 825 counties DOE places in zone 4, Lamb County ranks 696th. Against Texas's own average of $1,035/year, Lamb County runs 20% above that.
The climate data behind this
Lamb County's climate figures — 3,772 heating and 1,469 cooling degree days a year — are read from OLTON, TX US, 14.4 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Lamb County 2136th nationally by total degree days — the 32th percentile. DOE also classifies Lamb County as moisture regime B (dry) - ask a local contractor whether that changes the vapor-barrier approach for this job.
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 $182/year saved (~12.6-year payback). It is close - the payback only just fits a reasonable timeframe.
Getting it done in Lamb County
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 Lamb County, not a bid - contractors typically charge a $600 minimum regardless of job size.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.