Franklin County, VA Insulation Payback
Is attic insulation worth it in Franklin County, VA?
DOE classifies Franklin 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 $1,318 a year in heating and cooling — a payback around 2.6 years. Few home upgrades pay back that quickly.
Heating vs. cooling in Franklin County
Heating accounts for about $1,147/year of that and cooling about $171/year — Franklin County needs both. Nationally, Franklin County ranks in the 40th percentile for insulation savings potential. Compared only against its own climate zone, Franklin County places 551st out of 825. Against Virginia's own average of $1,342/year, Franklin County runs 2% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 4,290 HDD and 1,066 CDD (base 65°F, 1991-2020 normals) — come from ROCKY MT, VA US, the nearest NOAA station with published normals, 1.2 miles from Franklin County's center. That combined heating-and-cooling load ranks Franklin County 2024th nationally by total degree days — the 36th percentile. 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.
The smaller top-up scenario
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 $192/year saved (~11.9-year payback). Whether that is worth it depends on how long you plan to stay.
Quotes and materials for this job
Get more than one quote 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 asking upfront given Franklin County's estimated $1,318/year on the line.
Franklin County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Franklin 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.