Loudon County, TN Insulation Payback
Loudon County attic insulation, by the numbers
DOE classifies Loudon County as climate zone 4, mixed-humid — heating load in winter and cooling load in summer, both worth taking seriously here. Its recommended attic R-value for bare joists is R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,224 a year in heating and cooling — a payback around 2.8 years. Topping up the attic pays for itself fast here.
Heating vs. cooling in Loudon County
Split it out and it's roughly $977 a year on the heating side, $247 on cooling. By estimated insulation savings, Loudon County lands in the 33th percentile nationally. Zone 4 alone covers 825 counties in this dataset, and Loudon County comes in 719th by savings. Tennessee averages $1,258/year across the counties tracked here; Loudon County comes in 3% lower.
Where these numbers come from
NOAA's LENOIR CITY, TN US station, 4.6 miles from Loudon County, supplies the 3,654 HDD and 1,536 CDD this estimate runs on. That combined heating-and-cooling load ranks Loudon County 2185th nationally by total degree days — the 31th percentile. One local detail the R-value alone won't tell you: Loudon 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 $178/year saved — roughly 12.8 years to break even. Call this borderline rather than a clear win.
Getting it done in Loudon 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 Loudon County, not a bid - contractors typically charge a $600 minimum regardless of job size.
Where these figures come from
Loudon 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.