Dickson County, TN Insulation Payback
Dickson County attic insulation, by the numbers
Dickson County, Tennessee is zone 4 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-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,236 a year — payback in roughly 2.8 years. Topping up the attic pays for itself fast here.
Where the savings come from
Split it out and it's roughly $1,023 a year on the heating side, $213 on cooling. By estimated insulation savings, Dickson County lands in the 34th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Dickson County comes in 706th by savings. Tennessee averages $1,258/year across the counties tracked here; Dickson County comes in 2% lower.
Where these numbers come from
The heating and cooling degree days behind this estimate — 3,826 HDD and 1,327 CDD (base 65°F, 1991-2020 normals) — come from DICKSON, TN US, the nearest NOAA station with published normals, 5.2 miles from Dickson County's center. By total degree days, Dickson County sits at the 30th percentile nationally. One local detail the R-value alone won't tell you: Dickson County sits in moisture regime A (humid), which can affect the vapor-barrier choice.
If the attic isn't bare
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $180/year saved — roughly 12.6 years to break even. Call this borderline rather than a clear win.
Quotes and materials for this job
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 Dickson County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Dickson 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.