Blount County, TN Insulation Payback
Is attic insulation worth it in Blount County, TN?
DOE classifies Blount 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. 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 $1,196 a year — payback in roughly 2.9 years.
Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $943/year of that and cooling about $253/year — Blount County needs both. Nationally, Blount County ranks in the 31st percentile for insulation savings potential. Compared only against its own climate zone, Blount County places 752nd out of 825. Against Tennessee's own average of $1,258/year, Blount County runs 5% below that.
The climate data behind this
NOAA's Knoxville Mcghee Tyson AP, TN US station, 9.6 miles from Blount County, supplies the 3,528 HDD and 1,574 CDD this estimate runs on. By total degree days, Blount County sits at the 29th percentile nationally. Its moisture regime is classified humid, which matters for whether the attic needs a vapor retarder as part of the job — worth asking a contractor about locally.
Already have some insulation?
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $174/year saved (~13.1-year payback). Whether that is worth it depends on how long you plan to stay.
Getting it done in Blount County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first, so treat the $3,480 figure above as a planning number for Blount County, not a bid. Worth getting quotes from at least two local contractors before committing - most charge a $600 minimum regardless of job size.
Blount County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Blount County's numbers, and where the cost assumptions come from. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.