Bradley County, TN Insulation Payback
Bradley County, TN: what topping up your attic actually costs
Bradley County sits in IECC climate zone 4 (Mixed-Humid) — heating load in winter and cooling load in summer, both worth taking seriously here. For a currently uninsulated attic, DOE and Energy Star recommend building 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 $1,177 a year — payback in roughly 3 years.
That's about as fast as attic paybacks get.
Heating vs. cooling in Bradley County
The estimated savings split roughly $929/year heating, $248/year cooling. Out of every 100 US counties tracked here, Bradley County's savings potential beats roughly 29 of them. Within zone 4 specifically, it ranks 772nd of 825 counties by estimated savings. Tennessee averages $1,258/year across the counties tracked here; Bradley County comes in 6% lower.
Bradley County's actual weather, not a national average
Bradley County's climate figures — 3,474 heating and 1,542 cooling degree days a year — are read from Cleveland Fltr PLT, TN US, 5.9 miles away, NOAA's nearest 1991-2020 normals station. That combined heating-and-cooling load ranks Bradley County 2336th nationally by total degree days — the 26th percentile. Bradley County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
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 $172/year saved — roughly 13.3 years to break even. This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
Get quotes from at least two local contractors 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 checking upfront given Bradley County's estimated $1,177/year on the line.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.