Insulation Contractors on Hilton Head Island, SC

Older houses

The median home in the Town of Hilton Head Island was built in 1987, and about 78% were built before 2000 (as of 2024). In the 29928 ZIP code, which covers the south end, the median is 1985. Attics and crawl spaces from those years were insulated to older standards.

Cooling is the big bill

The island averages about 2,600 cooling degree days a year against about 1,700 heating degree days, and roughly 85% of the cooling load falls between May and September. A hot attic is the first place to look.

Electric heat

About 93% of island homes heat with electricity (as of 2024), so a tighter, better-insulated house lowers the load on the heat pump all year, not just in summer.

Homes used part of the year

About 1 in 4 homes in the Town of Hilton Head Island is held for seasonal or occasional use, and about 1 in 3 in the 29928 ZIP code. A sealed attic or crawl space matters most in a house that sits closed up through a humid summer.

Where the offices are

Coastal Foam & Insulation is on William Hilton Pkwy, 0.9 mi from the Hilton Head Plantation main gate. Island Spray Foam and Energy One America are on the mainland in Bluffton, and both name Hilton Head Island on their own websites.

Foam changes the attic

Spray foam applied to the roof deck turns a vented attic into a conditioned one. Ask the installer how the air conditioner and ventilation are handled afterward.

Insulation work on Hilton Head comes down to three places: the attic, the crawl space and the walls of a new build. Coastal Foam & Insulation lists spray foam, attic insulation and crawl space insulation. Island Spray Foam lists attic and crawl space spray foam, old-insulation removal, new construction, fiberglass and soundproofing. Energy One America lists open and closed cell spray foam, blown-in cellulose and fiberglass batts, plus an in-home energy audit.

Most island houses are older than most Lowcountry houses: the median was built in 1987 and about 78% before 2000, so the question is often a thin attic layer, settled batts or a leaky crawl space. Your homeowners insurance may care about the roof and attic too; see wind insurance on Hilton Head.

With about 2,600 cooling degree days a year and most of them between May and September, the attic is where the heat gets in. Two routes: blown-in insulation (cellulose or fiberglass) laid over the attic floor, which Energy One America lists, or spray foam on the underside of the roof deck, which Coastal Foam & Insulation, Island Spray Foam and Energy One all list. Foam on the roof deck puts the ducts and the air handler inside the conditioned space.

A closed attic needs the air conditioner and ventilation looked at afterward. If the system is old, compare the quote with a new HVAC installation on the island, and if you are replacing the system anyway, ask the HVAC company whether it should be sized for the insulated house. Leaky ducts waste the same energy; see air duct cleaning for the duct side.

Looking for spray foam insulation on Hilton Head Island, SC? Energy One America lists both open cell and closed cell foam, so ask which one the quote uses and where. Ask for the thickness in writing, ask whether the roof deck or the attic floor is being sprayed, and ask what happens if the air conditioner struggles with humidity after the attic is sealed.

Check the license before the deposit: South Carolina contractors are licensed by the state’s Department of Labor, Licensing and Regulation, and the license check on our island home services page walks through it. Coastal Foam & Insulation does not publish a license number or years in business, and Island Spray Foam says it has been in business since 2005, so ask each for a license and proof of insurance.

Coastal Foam & Insulation and Island Spray Foam both list crawl spaces. A wet crawl space can put moisture in the floor and the ducts, so ask about drainage first and the foam second. If you already smell mustiness, read about mold remediation before you cover anything over.

Houses that sit closed for months, like the roughly 1 in 4 island homes held for seasonal use, are the ones where a damp crawl space goes unnoticed longest. If the ducts run through the crawl space, the same crew that insulates it should say whether a duct leak is part of the problem; an HVAC company can test that.

Island Spray Foam names Hilton Head Island on its attic insulation page and Energy One America lists the island among its service areas. Island Spray Foam is on University Pkwy, 17.7 mi from Shelter Cove, and Energy One is in Old Town Bluffton, 9.1 mi from it. Call first and ask whether the company will come to your street, and whether there is a trip charge, since a service area on a website is not a promise for every address.

Palms Spray Foam and Atlantic Spray Foam work in Bluffton, Okatie and Ridgeland without naming the island; see the Bluffton insulation page for them. Roof leaks that ruin insulation are a roofer job first.

None of these companies publishes a price list. Cost depends on the material (spray foam costs more than blown-in), the thickness, the square footage of the attic or crawl space, and whether old insulation has to come out first. Get two or three written estimates that name the material, the thickness and what is included, and compare them line by line. For where insulation fits in the bigger picture of owning here, see the cost of living on Hilton Head.