Written by Dan and Javier Morales

The Long Island Homeowner’s Insulation Guide

Name: Long Island Insulation Co.
Address: 228 West Jericho Turnpike, Huntington Station, NY, 11746, US
Telephone: (631) 641-5536
Price range: $$-$$$
Rating: 4.9

Everything we wish every Long Island homeowner knew before calling a insulation contractor. Honest answers to the questions we get asked every week. No fluff, no AI-generated filler, just what we’ve learned from 680+ jobs across Nassau and Suffolk.

Get an Estimate (631) 641-5536

Licensed Nassau & Suffolk

HIC #H0109620000 · #44127-H

$2,000,000 Insured

General liability + workers comp

NYSERDA Approved

Factory certified installer

BBB A+ Accredited

Since 2011

4.9★ on Google

214+ reviews

680+ homes done

Nassau & Suffolk · 2013 to now

Attic Insulation Long Island: What R-Value You Need and What It Costs in 2026

R-value targets for Long Island attics, 2026 installed cost ranges, PSEG and federal IRA rebates, and why most LI homes are still way below current code. Nassau and Suffolk guide.

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All guides & blog posts

Installation Guide7 min min

Attic Insulation Long Island: R-Values, Types & Cost Guide (2026)

Complete guide to attic insulation on Long Island — spray foam vs blown cellulose vs batts, R-38 vs R-49 targets, NYSERDA rebates, and Nassau/Suffolk contractor costs in 2026.

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How-To Guide8 min

Attic Insulation Removal on Long Island: When You Need It, What It Costs, and What Happens After

When to remove old attic insulation vs. add on top, 2026 removal costs for Nassau and Suffolk County, mold and pest scenarios, and what a removal job looks like start to finish.

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Installation Guide7 min min

Blown-In Insulation on Long Island: Cost, Process & When to Choose It

Blown-in insulation on Long Island — what it costs in 2026, how cellulose and fiberglass compare, when to choose it over spray foam, and what Nassau and Suffolk homeowners need to know about NYSERDA rebates.

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Rebates7 min min

NYSERDA Rebate Guide for Long Island Homeowners (2026)

How to get the full $5,000 NYSERDA insulation rebate on Long Island. Qualifying projects, the audit requirement, and how the paperwork really works.

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Basics6 min min

R-Value Guide for Long Island Homes

What R-value actually means, what Long Island homes typically need, and why the number on the insulation bag isn't always what you end up with.

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Cost Guide6 min min

Spray Foam Insulation Cost on Long Island (2026)

How much does spray foam insulation cost on Long Island in 2026? Open-cell vs closed-cell price comparison, cost per sq ft, attic vs crawl space vs rim joist, energy savings ROI, and permit requirements for Nassau and Suffolk.

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Materials6 min min

Spray Foam vs Cellulose on Long Island

When to use spray foam, when to use cellulose, and when each is wrong. Long Island-specific guidance from a BPI-certified insulation contractor.

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We handle the rebate paperwork — you just feel the difference.

680+

LI homes since 2011

4.9★

214 Google reviews

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