If you're a Naples homeowner watching your FPL bill climb past $300 every summer, you've probably looked into spray foam insulation. The first question is always: how much is this going to cost me?
| Type | Cost Per Sq Ft | Typical Attic (1,500 sq ft) | R-Value Per Inch |
|---|---|---|---|
| Open Cell Spray Foam | $1.00-$2.00 | $1,500-$3,000 | R-3.7 |
| Closed Cell Spray Foam | $2.00-$4.00 | $3,000-$6,000 | R-6.5 |
| Blown-In Fiberglass | $0.50-$1.25 | $750-$1,875 | R-2.5 |
| Fiberglass Batts | $0.30-$1.00 | $450-$1,500 | R-3.1 |
These are real contractor prices for Southwest Florida in 2026.
Florida's energy code requires minimum R-values: Attic/roof deck R-30, exterior walls R-13, crawl spaces R-19. For attics, we typically apply 5-6 inches of open cell or 3-4 inches of closed cell to the underside of the roof deck.
Open cell ($1-2/sq ft) expands to fill cavities, provides soundproofing, and creates an air seal. Go-to for attics and interior walls.
Closed cell ($2-4/sq ft) is denser, provides a moisture AND air barrier, adds structural rigidity. Recommended for crawl spaces, coastal homes, flood zones, and garages.
Open attics are straightforward. Cathedral ceilings or tight crawl spaces cost more. If we need to remove old insulation first, add $1-2/sq ft.
| Before | After | |
|---|---|---|
| Monthly FPL (summer) | $350-450 | $210-300 |
| Monthly FPL (winter) | $150-200 | $100-140 |
| Annual cost | $3,000-3,900 | $1,860-2,640 |
We guarantee minimum 30% electric bill reduction. Most see 30-40%.
As an FPL Preferred Contractor, we handle all paperwork. An instant $220 rebate on ceiling insulation through the FPL PIC program. Get Your Free Energy Audit →
Full comparison: Spray Foam vs Fiberglass vs Blown-In →
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