Hickman County, TN Insulation Payback
Hickman County attic insulation, by the numbers
DOE classifies Hickman County as climate zone 4, 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-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 2.7 years at an estimated $1,267/year saved. Topping up the attic pays for itself fast here.
Heating vs. cooling in Hickman County
Split it out and it's roughly $1,070 a year on the heating side, $196 on cooling. By estimated insulation savings, Hickman County lands in the 36th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Hickman County comes in 646th by savings. Tennessee averages $1,258/year across the counties tracked here; Hickman County comes in 1% higher.
The climate data behind this
Hickman County's climate figures — 4,003 heating and 1,222 cooling degree days a year — are read from CENTERVILLE 4NE, TN US, 3.2 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Hickman County 2154th nationally by total degree days — the 32th percentile. One local detail the R-value alone won't tell you: Hickman County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
The smaller top-up scenario
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $185/year saved — roughly 12.3 years to break even. Call this borderline rather than a clear win.
Getting it done in Hickman 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 Hickman County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Hickman County's R-60 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-60 is the target here specifically.