Lauderdale County, TN Insulation Payback
Lauderdale County attic insulation, by the numbers
DOE classifies Lauderdale County as climate zone 3, mixed-humid — a genuine mix of cold winters and humid summers, with neither one dominating the bill. Its recommended attic R-value for bare joists is 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 $1,203/year saved. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $923 a year on the heating side, $280 on cooling. By estimated insulation savings, Lauderdale County lands in the 31th percentile nationally. Zone 3 alone covers 690 counties in this dataset, and Lauderdale County comes in 92nd by savings. Tennessee averages $1,258/year across the counties tracked here; Lauderdale County comes in 4% lower.
Where these numbers come from
Lauderdale County's climate figures — 3,478 heating and 1,757 cooling degree days a year — are read from RIPLEY, TN US, 7.9 miles away, NOAA's nearest 1991-2020 normals station. By total degree days, Lauderdale County sits at the 32th percentile nationally. One local detail the R-value alone won't tell you: Lauderdale County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
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 $162/year saved (~10-year payback). Call this borderline rather than a clear win.
Getting it done in Lauderdale County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $2,820 figure above as a planning number for Lauderdale County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Lauderdale 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.