1
Why Air Sealing Comes First
2
R-49 vs R-60 — Which Do You Need?
3
Cellulose vs Fiberglass — Which Blow-In?
4
Attic Insulation on Long Island: Local Code, Climate, and Rebates
5
Attic Insulation Cost Long Island NY — 2026 Price Guide
| Scope | Material | Installed Cost |
|---|---|---|
| R-38 upgrade (blow-over existing) | Blown-in cellulose | $1,200–$2,000 |
| R-49 full replacement (air seal + blow) | Blown-in cellulose | $2,500–$4,500 |
| R-60 full replacement (air seal + blow) | Blown-in cellulose | $2,800–$5,500 |
| Open-cell spray foam (rafters) | Spray foam | $3,000–$6,000 |
| Complex Cape Cod (3 zones) | Cellulose + batts | $4,000–$8,000 |
NYSERDA Comfort Home rebates reduce out-of-pocket cost by $1,000–$3,000 depending on existing R-value and project scope. Income-qualified households may qualify for EmPower+, which can cover 100% of the project cost. We handle all rebate paperwork in-house — you sign once and we submit everything directly to NYSERDA. Typical rebate turnaround is 8–12 weeks after installation.
For a precise number on your specific house, call us or submit the online form. We schedule free BPI energy audits within 2–3 business days and provide a written quote within 48 hours of the audit.
