Union County, GA Insulation Payback
Union County, GA: what topping up your attic actually costs
Union County, Georgia 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 $1,244 a year — payback in roughly 2.8 years. That's about as fast as attic paybacks get.
Where the savings come from
The estimated savings split roughly $1,107/year heating, $136/year cooling. Out of every 100 US counties tracked here, Union County's savings potential beats roughly 34 of them. Within zone 4 specifically, it ranks 698th of 825 counties by estimated savings. Georgia averages $974/year across the counties tracked here; Union County comes in 28% higher.
The climate data behind this
NOAA's BLAIRSVILLE EXP STN, GA US station, 2.9 miles from Union County, supplies the 4,142 HDD and 849 CDD this estimate runs on. Combined heating and cooling load puts Union County in the 26th percentile of this 3,162-county dataset. Union County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
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 $181/year saved (~12.6-year payback). This one is a genuine toss-up, not a clear yes.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Union County job, not a quote. Expect at least a $600 minimum charge from most contractors.
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.