Dyer County, TN Insulation Payback
Is attic insulation worth it in Dyer County, TN?
Dyer County, Tennessee is zone 3 under DOE's climate map (Mixed-Humid), which means heating load in winter and cooling load in summer, both worth taking seriously here. An uninsulated attic there should be built up to R-49. Going from R-2 to the recommended R-49 costs roughly $2,820 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.3 years at an estimated $1,243/year saved. Few home upgrades pay back that quickly.
The breakdown behind the number
Heating accounts for about $951/year of that and cooling about $292/year — Dyer County needs both. Nationally, Dyer County ranks in the 34th percentile for insulation savings potential. Compared only against its own climate zone, Dyer County places 55th out of 690. Against Tennessee's own average of $1,258/year, Dyer County runs 1% below that.
The climate data behind this
The heating and cooling degree days behind this estimate — 3,585 HDD and 1,830 CDD (base 65°F, 1991-2020 normals) — come from DYERSBURG III GOLF, TN US, the nearest NOAA station with published normals, 3.6 miles from Dyer County's center. Combined heating and cooling load puts Dyer County in the 38th percentile of this 3,162-county dataset. 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.
The smaller top-up scenario
A shallower starting point changes the math: with R-11 already down, only the gap to R-38 needs filling, at roughly $1,620 for an estimated $167/year saved (~9.7-year payback). Whether that is worth it depends on how long you plan to stay.
Next steps for a Dyer County attic
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 Dyer County's estimated $1,243/year on the line.
Dyer County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Dyer 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.