Coats, NC
8 miles east
Its NOAA station logs about 410 fewer heating degree days than Lillington's; 2,370 people, about half of Lillington's population
Attic insulation in CoatsAttic Insulation in Lillington, NC
Blown-in attic insulation for Lillington, NC, in Harnett County, plus removal and air sealing.
About Lillington and Its Homes
Lillington was set up in 1859 as the Harnett County seat on land above the Cape Fear River. It stayed small until the river was bridged in 1900 and the railroad came through in 1903, and its oldest houses stand in the blocks just south of Front Street.
Lillington, in Harnett County, grew from 4,860 people in 2020 to 5,040 in 2025 (Census Bureau estimates), on 7.17 square miles. That makes Lillington the third-largest town in Harnett County.
Lillington has about 1,330 housing units, 2 percent of Harnett County's; 63 percent of the town's households own their home.
Lillington at a Glance
- County: Harnett County
- Population: 5,040 (2025), 4,860 (2020), up 3.7%
- Land area: 7.17 square miles (703 people each)
- Housing units: about 1,330 (±153)
- Owner-occupied: 63% (±5); Harnett County: 71%
- Detached houses: 77% (±3); Harnett County: 71%
- Attached houses: under 3%
- Apartments: 21% (±7)
- Climate zone: 4 (state code), 3 (2021 map)
- ENERGY STAR target for Lillington attics: R-49 from bare, R-38 over 3 to 4 inches (R-value guide)
Census Bureau estimates for Lillington, 2020 to 2024 (± margin of error).
Lillington Homes and Their Attics
Queen Anne Houses South of Front Street
The state's 2008 survey of Harnett County calls the area between Front and McNeil streets, around 8th, 9th and 10th, Lillington's oldest neighborhood. It describes Queen Anne houses of about 1890 to 1900 with interior chimneys, one with two and the old Atkins House, converted to the town hall, with three. A two-story house of about 1890 has a rear ell under its own hip roof. Where a chimney passes up through the attic floor, there is an opening around the masonry. ENERGY STAR calls for aluminum flashing and heat-resistant caulk to close it, with a metal dam holding insulation 2 inches off the brick. A rear ell under a separate roof can mean a second attic, and we check it as well.
Attic Insulation in Lillington
About 25 percent of Lillington's homes predate 1970; if your joists show above the insulation, ENERGY STAR says to add more insulation.
In 2010 or later, about 45 percent of Lillington homes went up; check their air sealing as well as the depth.
The Local Climate
Lillington's center sits about 190 feet above sea level, under a mile from NOAA's Lillington station, the best match for Lillington. The station's 1991 to 2020 normals average about 3,320 heating and 1,680 cooling degree days a year, so at Lillington's station, heating needs outweigh cooling.
Readings change over short distances around Lillington: NOAA's Dunn 4 NW station, 9 miles away, averages about 2,910 heating degree days. NOAA estimated part of the Lillington station's normals from nearby stations, so treat them as approximate.
Homes by Age: What It Means for the Attic
Some 77 percent of Lillington housing units are detached single-family houses.
Built from 1940 to 1969, 19 percent of Lillington homes often have little insulation.
About 30 percent of Lillington's housing units predate 1980; nearly all predate the state's 1978 insulation rule too.
Homes by Year Built
- Before 1940: 8% (±5), about 105 units
- 1940s: 6% (±3), about 80 units
- 1950s: 6% (±3), about 85 units
- 1960s: 7% (±4), about 90 units
- 1970s: 4% (±2), about 50 units
- 1980s: 6% (±4), about 80 units
- 1990s: 9% (±5), about 115 units
- 2000s: 8% (±4), about 105 units
- 2010s: 36% (±7), about 470 units
- 2020 or later: 11% (±5), about 140 units
Air Sealing and Duct Sealing in Lillington
In Lillington, about 76 percent of homes heat with electricity; where that heat is forced air, ducts often run through the attic.
Air sealing comes first, as the EPA advises: wire and pipe holes, wall tops and soffits.
How Homes Here Are Heated
- Electricity: 76% (±9), about 930 households; Harnett County: 83%
- Piped gas: 19% (±7), about 230 households
- Bottled or tank gas: 5% (±3), about 55 households
Power, Gas and Rebates
Duke Energy Progress supplies Lillington's electricity. For gas, Lillington is in the Harnett County franchise of Piedmont Natural Gas, and about 19 percent of the town's homes heat with piped gas. Duke's free House Call fits many Lillington homes: about 76 percent heat with electricity.
Rebate to check in Lillington: Smart $aver Insulate and Seal (Duke Energy; Insulation Pros is an approved trade ally). Before a job in Lillington, check its current terms; the Harnett County page lists every program.
Attic Insulation Removal in Lillington
In a Lillington attic, only wet, moldy or animal-soiled insulation is vacuumed out (ENERGY STAR's test), once the cause is fixed, and after mice that Lillington attic is sanitized and deodorized; dry, clean insulation stays.
Also Serving Near Lillington
Nearest to Lillington first.
Angier, NC
8 miles northeast
Its NOAA station logs about 310 more heating degree days than Lillington's
Attic insulation in AngierLinden, NC
12 miles south
139 people, under a tenth of Lillington's population
Attic insulation in LindenFuquay-Varina, NC
13 miles north
Power from Duke Energy (Lillington: Duke Energy Progress); Center about 200 feet higher than Lillington's
Attic insulation in Fuquay-Varina
Lillington Insulation FAQs
Is the old part of Lillington a listed historic district?
Not a listed one. The 2008 Harnett County survey described a Lillington Historic District south of Front Street and put it on the National Register study list. That marks a district as potentially eligible, not as listed. The state's current register list shows no property in town, and its 2023 roster of preservation commissions has no entry for Harnett County. So no historic rule governs the attic in your house. The checks every older house needs before insulation still apply.
Why does the bonus room over my Lillington garage run hot and cold?
Because unheated space surrounds it on several sides. Census figures put most of Lillington's housing in 1970 or later. If yours is one of the newer houses with a room above the garage, the trouble usually lies in what touches it. Building America advises sealing the air paths through the garage ceiling below the room, with insulation pressed up against the subfloor. ENERGY STAR adds the short side walls and the attic pockets behind them, which often leak. We seal and insulate those spaces, and garage insulation is a service we offer as well.
Could the old insulation in a Lillington attic be vermiculite?
It could: about 20 percent of Lillington's homes predate 1960. If a Lillington attic holds a pebble-like gray-brown or silver-gold fill, leave it undisturbed: the EPA says vermiculite may contain asbestos.
Does attic insulation in Lillington need a permit?
Lillington Town Hall can say whether Harnett County Development Services, the town itself or another office handles permits in Lillington; ask before work starts.
Helpful Guides
- Power from Duke Energy Progress: high summer electric bills and home energy audits
Sources
Census Bureau figures for Lillington, NOAA normals for the Lillington station, Duke Energy Progress (October 2026). Compiled by Insulation Pros. How the town pages are made.
Sources for the Lillington notes and questions (read October 20, 2026):
- Historic and Architectural Resources of Harnett County, North Carolina, ca. 1770-1950 (Harnett County Survey, December 2008), NC State Historic Preservation Office
- About Lillington, Town of Lillington
- Furnace Flues Require Special Sealing Techniques, ENERGY STAR do-it-yourself guide
- NC Listings in the National Register of Historic Places, NC State Historic Preservation Office
- Historic Preservation Commission Staff in North Carolina, listed by county, as of 2/20/2023 (NC HPO)
- Year Structure Built (table B25034), Lillington town, American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau via Census Reporter
- Floor Above Garage, Building America Solution Center (PNNL, U.S. DOE)
- Attic Air Sealing Project, ENERGY STAR
Lillington, NC
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Insulation Pros is an insulation contractor serving North Carolina, Lillington and the rest of Harnett County included.
Reach us
Send the square footage of your Lillington attic, or call (336) 870-3893.