Chittenden County, VT Insulation Payback
Is attic insulation worth it in Chittenden County, VT?
DOE classifies Chittenden County as climate zone 6, cold — cold enough that heating, not cooling, is what decides the bill. 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 $2,045 a year in heating and cooling — a payback around 1.7 years. Few home upgrades pay back that quickly.
Where the savings come from
Heating accounts for about $1,953/year of that and cooling about $91/year — Chittenden County needs both. Nationally, Chittenden County ranks in the 84th percentile for insulation savings potential. Compared only against its own climate zone, Chittenden County places 355th out of 459. Against Vermont's own average of $2,179/year, Chittenden County runs 6% below that.
Chittenden County's actual weather, not a national average
NOAA's ESSEX JUNCTION 1 N, VT US station, 3.9 miles from Chittenden County, supplies the 7,306 HDD and 568 CDD this estimate runs on. Combined heating and cooling load puts Chittenden County in the 85th percentile of this 3,162-county dataset. 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.
If the attic isn't bare
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 $298/year saved (~7.6-year payback). The math clears comfortably within a normal ownership horizon.
Getting it done in Chittenden County
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 Chittenden County job, not a quote. Expect at least a $600 minimum charge from most contractors.
Chittenden County's numbers, sourced
The methodology guide lists exactly which DOE and NOAA sources feed Chittenden 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.