Basement Insulation

Basement Insulation Rebates 75-100% off costs.

Improve your basement with our help and potentially get back 75%-100% of insulation costs via Energize Connecticut, available to Eversource and United Illuminating customers.

In Connecticut, where moisture and cold can seep through unguarded basements, proper insulation not only enhances energy efficiency but also converts your basement into a comfortable extension of your living space. Learn about insulation materials, including rigid foam board and spray foam, designed to tackle moisture control and thermal bridging, making your basement a dry and warm area all year round.

Understanding Basement Insulation

Insulating your basement in Connecticut enhances energy efficiency, reduces heat loss, and integrates this often-overlooked area into your home’s overall comfort and thermal performance. Key issues include moisture control, thermal bridging, and ensuring the right material and installation method to avoid common pitfalls like mold growth and energy leakage.

New wooden house in foam for insulation the wall of a basement unfinished under construction

Advantages of Basement Insulation

Energy Efficiency Benefits: Proper insulation can significantly reduce energy bills by maintaining consistent temperatures in your basement and throughout your home.

Moisture and Mold Prevention: Correct insulation methods and materials can help prevent moisture ingress and reduce the risk of mold and mildew, common issues in Connecticut basements.

Improved Living Space Comfort: Insulating your basement turns it into a comfortable living space year-round, increasing your home’s usable area and overall value.

Frequently Asked Questions about Basement Insulation

It always depends on the specific home. Rigid foam insulation is often used due to its ability to prevent thermal bridging and moisture problems. It's suitable for both interior and exterior applications in basements​​​. However Spray foam can also be used quite effectively and may be more suitable depending on the home.

Yes, air sealing is crucial to prevent moisture problems and enhance energy efficiency, especially before insulating. Although concrete walls themselves are not typically leaky, air sealing other parts of the basement is essential​

A simple test using plastic sheeting taped to the walls can help determine if moisture is seeping through. If condensation appears, it indicates a moisture issue that needs addressing before insulation​

Stone-and-mortar walls can be challenging due to their uneven surface, making closed-cell spray foam the only viable option for insulation in such cases​


While spray foam offers excellent air sealing and moisture resistance, it's more expensive than other types. It’s ideal for basements prone to moisture but may not be cost-effective for all homeowners​

Yes, especially if there is no existing vapor barrier below the slab. A vapor barrier above the slab, under the insulation, helps control moisture levels and prevents damage to floor coverings and paints​

Proper insulation and moisture control can significantly reduce the risk of mold growth in basements. Mold thrives on moisture and organic materials, so controlling humidity and using appropriate insulation materials is key​

Yes, insulating the basement ceiling can reduce sound transmission to other parts of the house, as well as control allergens. However, it may also reduce ceiling height and affect airflow​

Basement Insulation Materials

  • Spray Foam Basement Insulation

    Spray Foam Basement Insulation

    Offers both insulation and air sealing, which can be particularly beneficial in basements with irregular surfaces or where higher R-values are required.

    Learn More

  • Blown Cellulose Basement Insulation

    Blown Cellulose Basement Insulation

    Not typically recommended for basements due to moisture concerns, but if used, it should be in conjunction with proper moisture barriers and ventilation strategies.

    Learn More

  • Blanket/Batt Basement Insulation

    Blanket/Batt Basement Insulation

    While usable in basements, batt insulation requires careful installation against a properly framed wall, with a focus on moisture control to prevent mold and mildew growth.

    Learn More

  • Rigid/Foam Basement Insulation

    Rigid/Foam Basement Insulation

    Highly recommended for basements, rigid foam provides excellent thermal insulation and moisture resistance, making it ideal for direct application to basement walls.

    Learn More

Qualify for Basement Insulation Rebates by Getting a Home Energy Audit


Service Cost (free-of-charge if eligible*)


Average Annual Energy Savings


Weatherization Service Value


Average 1st Year Savings

Rebates for Basement Insulation


Energize CT Rebate: $1.70 per Square Foot
Avg. Initial Cost $1500-$10000
Max Rebate N/A
Avg. Lifetime Savings $4000

Claim up to $1.70 per square foot on approved insulation projects recommended during a Home Energy Solutions assessment.This may cover between 75-100% of insulation costs!

Learn More


IRA Tax Credit: % of Costs
25C Max Credit $1600
25D Max Credit Uncapped

The Inflation Reduction Act tax credit for weatherization in Connecticut offers homeowners a 30% tax credit for eligible projects, with a maximum claim of $1,200 per year. It covers insulation, air sealing, doors, windows, and energy audits. Weatherization reduces energy waste, lowers bills, and improves home comfort while decreasing carbon emissions.

Learn More


IRA Electrification Rebate: $1600
Upfront Discount 50%-100% of Costs
Avg. Initial Cost N/A

Connecticut homeowners may be eligible to claim up to $1,600 for their weatherization project through the Inflation Reduction Act Electrification Rebate program, depending on their income. Low-income households can receive 100% coverage of weatherization costs, while moderate-income households can receive 50% coverage. (The total cap for Electrification Rebates across all qualified projects is $14,000.)

Learn More

Other Areas to Install Insulation


Want to know about pricing? Get a FREE quote today!

Scroll to Top