Denton County, TX Insulation Payback
Attic insulation payback for Denton County, TX
Denton County sits in IECC climate zone 3 (Hot-Humid) — summers that stay hot and humid while winters barely register on the energy bill. For a currently uninsulated attic, DOE and ENERGY STAR recommend building 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 $1,079 a year — payback in roughly 2.6 years. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $657/year comes from reduced heating and $422/year from reduced cooling load through the ceiling. Denton County beats 23% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 690 counties DOE places in zone 3, Denton County ranks 289th. Against Texas's own average of $1,035/year, Denton County runs 4% above that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 2,477 HDD and 2,646 CDD (base 65°F, 1991-2020 normals) — come from DENTON 2 SE, TX US, the nearest NOAA station with published normals, 1 miles from Denton County's center. Combined heating and cooling load puts Denton County in the 29th percentile of this 3,162-county dataset. DOE also classifies Denton County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
Already have some insulation?
If Denton 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 $145/year — payback about 11.1 years. It is close - the payback only just fits a reasonable timeframe.
Getting it done in Denton County
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 Denton County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.