Attic Insulation in Harnett County, NC

Harnett County and Its Homes

Harnett County grew 12 percent from 2020 to 2025, to 150,137 people by the Census Bureau's estimate, in about 54,900 housing units.

Its five incorporated towns each have a page here: Angier, Dunn, Lillington, Erwin and Coats. About 20 percent of Harnett County's housing units are inside town limits, the rest in unincorporated areas.

Brick storefronts at a downtown intersection in Angier, with traffic signals overhead — Downtown Angier, North Carolina; Angier is the largest town in Harnett County. Photo: Indy beetle, CC0, via Wikimedia Commons

Harnett County at a Glance

Population: 150,137 (2025), 133,716 (2020)
Housing units: about 54,900
Median year built: 1997 (North Carolina: 1991)
Built before 1980: 27% (statewide: 34%)
Detached houses: 71%
Mobile homes: 18%
Owner-occupied: 71%
Heated with electricity: 83% (statewide: 65%)
Climate zone: 3 (2021 map), 4 (state code)
Towns with pages here: 5

Census Bureau estimates for Harnett County (housing: 2020 to 2024).

Towns and Communities in Harnett County

Angier
9,410 people · median home 1998 · Duke Energy Progress
Dunn
8,814 people · median home 1973 · Duke Energy Progress
Lillington
5,040 people · Duke Energy Progress
Erwin
4,956 people · Duke Energy Progress
Coats
2,370 people · median home 1978 · Duke Energy Progress

Unincorporated communities the Census Bureau maps in Harnett County: Anderson Creek (about 5,200 housing units, median year built 2005), Spout Springs (about 4,000 housing units, median year built 2010), Buies Creek (about 1,300 housing units), Mamers and Bunnlevel.

What We Do in Harnett County

Attic Insulation in Harnett County
Some 27 percent of Harnett County housing units predate 1980; joists showing above their insulation mean more blown-in fiberglass is due, R-49 from bare.
Attic Insulation Removal in Harnett County
Wet, moldy or animal-soiled insulation comes out of Harnett County attics, and a mouse-soiled Harnett County attic is sanitized and deodorized; in the 11 percent of homes built before 1960, vermiculite is ruled out first.
Air Sealing in Harnett County
Some 83 percent of Harnett County homes heat with electricity, often through attic ducts; their joints and the ceiling's gaps are sealed first.

Homes in Harnett County

Half of Harnett County's 54,900 housing units were built before 1997: 18 percent before 1970, 27 percent before 1980 (nearly all before the state's 1978 insulation rule) and 21 percent in 2010 or later. The largest share went up in the 2000s, under codes that asked for less than ENERGY STAR now suggests; ENERGY STAR notes insulation is often thinnest at the eaves. Among Harnett County towns, the median home is oldest in Dunn (1973) and newest in Angier (1998).

Harnett County by type: 71 percent detached houses, 8 percent in buildings of two or more homes and 18 percent mobile homes. In Harnett County, 83 percent of homes heat with electricity, 7 percent with piped gas (24 percent statewide) and 8 percent with tank gas.

Harnett County Homes by Year Built

Before 1940: about 2,600 units, 5% (±1)
1940s: about 1,240 units, 2% (±1)
1950s: about 2,350 units, 4% (±1)
1960s: about 3,510 units, 6% (±1)
1970s: about 5,360 units, 10% (±1)
1980s: about 5,760 units, 10% (±1)
1990s: about 9,920 units, 18% (±1)
2000s: about 12,480 units, 23% (±1)
2010s: about 9,680 units, 18% (±1)
2020 or later: about 2,010 units, 4% (±1)

Climate Across Harnett County

NOAA 1991 to 2020 normals for Harnett County towns, by station: Dunn 4 NW station (Dunn, Erwin and Coats): about 2,910 heating and 1,970 cooling degree days; Garner station (Angier): about 3,640 heating and 1,340 cooling degree days; Lillington station (Lillington): about 3,320 heating and 1,680 cooling degree days.

Power and Gas in Harnett County

The card lists Harnett County's town and countryside utilities by the territory maps; a power bill confirms the one at an address.

Piedmont Natural Gas holds the Harnett County gas franchise (NC Utilities Commission map), and 7 percent of Harnett County homes heat with piped gas.

Who Supplies Power in Harnett County

Duke Energy Progress: Angier, Dunn, Lillington, Erwin and Coats
South River EMC: homes near Dunn and Erwin
Central Electric: other parts of Harnett County

Energy Programs for Harnett County Homes

Check each program's current terms for a Harnett County home; some pay only through the utility's contractor network. Insulation Pros is an approved Duke Energy trade ally for Duke's rebate.

Programs for Harnett County

Smart $aver Insulate and Seal (Duke Energy rebate; Angier, Dunn, Lillington, Erwin and more).
Home Energy House Call (Duke Energy home assessment; Angier, Dunn, Lillington, Erwin and more).
Energy audit (South River EMC; near Dunn and near Erwin): a walk-through home energy audit for members.
Residential energy audits (Central Electric; parts of Harnett County): home energy audits for members.
Income-qualified Weatherization (Duke Energy income-qualified; Angier, Dunn, Lillington, Erwin and more).
Low-income weatherization rebate (South River EMC; near Dunn and near Erwin): weatherization, income-qualified.
Energy Saver North Carolina (statewide income-qualified; any Harnett County address).
Weatherization Assistance Program (statewide income-qualified; any Harnett County address).
Piedmont Natural Gas lists rebates for high-efficiency gas furnaces, and none for insulation or air sealing (program page).

Get Your Free Estimate

or call (336) 870-3893

Harnett County Insulation FAQs

Do you serve all of Harnett County?

Yes: Angier, Dunn, Lillington, Erwin and Coats, and every unincorporated Harnett County address.

Which utilities offer insulation rebates in Harnett County?

Duke Energy's Smart $aver Insulate and Seal (Angier, Dunn, Lillington, Erwin and more).

Does attic insulation in Harnett County need a permit?

Ask Harnett County Development Services before work starts. For an address in Angier, Dunn, Lillington or another Harnett County town, the town or city hall can tell you whether Harnett County's office handles its permits.