Blown-in insulation (also called loose-fill) is made of small particles, typically fiberglass or cellulose, that are blown into attics, walls, or hard-to-reach spaces using specialized equipment. It conforms to irregular spaces and fills gaps around wiring, pipes, and framing that traditional batts often miss.

It depends on the space. Blown-in insulation is often better for attics and existing walls because it fills gaps and covers uneven surfaces more completely, reducing air leaks. Batts are easier to install in open, accessible areas like new construction walls. Many homes use a combination of both.

Homeowners often see savings of 10-30% on heating and cooling costs, especially if their attic previously had little to no insulation. Because it fills gaps so thoroughly, it reduces the air leakage that forces your HVAC system to work harder.

Installation is relatively quick, often completed in a few hours for an average attic and much less invasive than other insulation upgrades since it doesn't require removing drywall. For wall insulation, small holes are drilled and patched afterward, leaving minimal mess.

Cellulose insulation typically lasts 20-30 years, while fiberglass can last even longer, though it may settle over time and lose some effectiveness. Periodic attic inspections can catch settling early, and topping off insulation is usually far cheaper than a full replacement.