Attic, wall, crawlspace insulation & air-sealing
Thermline is a free service that helps homeowners compare common insulation projects and get matched with licensed, insured installers near them. On this page, you can see the main types of work many installers handle, including attic, wall, crawlspace, spray foam, blown-in, batt, and air-sealing.
Attic insulation
Attic insulation: blown-in, batt, and air-sealing the attic floor — the highest-payback insulation upgrade for most homes, and what it costs.
Open Insulation typesWall insulation
Insulating exterior walls, including dense-pack blown-in retrofit for finished walls — how it's done without a full tear-out, and typical costs.
Open Insulation typesCrawlspace & basement insulation
Insulating crawlspaces and basements — encapsulation, rim joists, and moisture control that keeps floors warmer and the home drier.
Open Insulation typesSpray foam insulation
Open- and closed-cell spray foam — high R-value per inch and built-in air-sealing, where it makes sense, and what it costs.
Open Insulation typesBlown-in & batt insulation
Loose-fill blown-in (fiberglass and cellulose) and fiberglass batts — the most common, budget-friendly insulation and how each is installed.
Open Insulation typesAir-sealing & weatherization
Sealing the leaks that waste heat — air-sealing the attic floor, rim joists, and gaps so your insulation can actually do its job.
OpenGet matched with a licensed insulation installer — free
Tell us about your project and your area. We connect you, at no cost, with licensed, insured insulation installers near you. You compare and choose who to hire.