Tarrant County, TX Insulation Payback
Is attic insulation worth it in Tarrant County, TX?
Tarrant County, Texas is zone 3 under DOE's climate map (Hot-Humid), which means long, muggy summers and mild winters, where cooling dominates the energy bill. An uninsulated attic there should be built up to R-49. For an attic around 1,000 square feet, closing the gap from R-2 to R-49 costs around $2,820 and saves an estimated $1,051 a year — payback in roughly 2.7 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Tarrant County
Heating accounts for about $640/year of that and cooling about $411/year — Tarrant County needs both. Nationally, Tarrant County ranks in the 20th percentile for insulation savings potential. Compared only against its own climate zone, Tarrant County places 357th out of 690. Against Texas's own average of $1,035/year, Tarrant County runs 2% above that.
Tarrant County's actual weather, not a national average
The heating and cooling degree days behind this estimate — 2,414 HDD and 2,577 CDD (base 65°F, 1991-2020 normals) — come from FT WORTH WSFO, TX US, the nearest NOAA station with published normals, 4.3 miles from Tarrant County's center. That combined heating-and-cooling load ranks Tarrant County 2356th nationally by total degree days — the 25th percentile. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-38 runs about $1,620 for about $142/year saved — roughly 11.4 years to break even. Whether that is worth it depends on how long you plan to stay.
Getting it done in Tarrant County
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 Tarrant County's estimated $1,051/year on the line.
Tarrant County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Tarrant County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.