How Much Energy Does Spray Foam Save?
The U.S. Department of Energy estimates that air sealing and insulation together can reduce heating and cooling costs by 15–30% for most homes. Spray foam — because it provides both air sealing and insulation simultaneously — consistently outperforms traditional insulation types, with CT homeowners reporting 30–50% reductions in heating costs after spray foam projects.
Real example: A typical 1,800 sq ft colonial in Fairfield County spending $2,800/year on heating and cooling can expect to save $700–$1,400/year after a full spray foam insulation project — paying back in 4–6 years and delivering ongoing savings for decades.
Connecticut Insulation Rebates 2026
Connecticut has some of the most generous energy efficiency rebate programs in the country. Two main utilities offer rebates:
Eversource (NSTAR/CL&P)
Home Energy Solutions (HES) program. Free energy audit. Rebates on insulation, air sealing, and equipment. Income-qualified households receive deeper subsidies.
United Illuminating (UI)
Same HES program structure for UI service territory (southern CT). Similar rebate amounts and income-based tiers.
EcoFoam works with both Eversource and UI programs. We help customers identify which rebates apply, complete the paperwork, and ensure installations meet program specifications.
Note: Rebate programs change annually. Contact EcoFoam or visit your utility's website for current 2026 amounts. Income-qualified households can receive up to 80–100% of project costs covered through HES Income program.
ROI & Payback Periods
| Project | Typical CT Cost (after rebates) | Annual Savings | Payback |
|---|---|---|---|
| Rim joist (spray foam) | $600 – $1,400 | $200 – $600 | 1–3 years |
| Attic air seal + blown-in | $1,000 – $2,500 | $300 – $600 | 3–5 years |
| Spray foam attic (conditioned) | $2,500 – $6,000 | $500 – $1,200 | 4–7 years |
| Basement walls (spray foam) | $1,200 – $3,000 | $200 – $500 | 4–8 years |
| Full home spray foam | $6,000 – $15,000 | $800 – $2,000 | 5–10 years |
Energy Savings by Project Type
- Rim joist: Highest ROI per dollar spent. Stops major air infiltration point. Saves $200–$600/year.
- Attic insulation/air sealing: Addresses largest heat loss area. Saves $300–$800/year for under-insulated homes.
- Basement insulation: Reduces floor cold, pipe freeze risk, and basement heat loss. Saves $150–$400/year.
- Crawl space encapsulation: Stops moisture and cold air infiltration from below. Saves $200–$500/year.
Frequently Asked Questions
Does insulation increase home value in Connecticut?
Yes. Studies show that every $1 saved in annual energy costs adds approximately $20 to home value. A $600/year savings from insulation adds ~$12,000 to resale value — often more than the project cost.
How do I apply for Connecticut insulation rebates?
The easiest path is to work with an approved contractor like EcoFoam who participates in the HES program. We handle the application and inspection process. You can also start at energizect.com for current program details.