Connecticut’s 2024 Building Code Changes Are Reshaping HVAC Requirements for Home Renovations—Here’s What You Need to Know
Connecticut homeowners planning renovations or HVAC upgrades in 2024 are facing a significantly changed regulatory landscape. The 2022 Connecticut State Building Code (CSBC) is based on the International Code Council’s widely-adopted 2021 International Codes and references the ICC A117.1-2017 standard for accessibility. It applies to projects with permit applications filed from October 1, 2022. However, with the next state building, fire safety, and fire prevention codes expected to take effect in mid-2026, homeowners are navigating both current requirements and preparing for upcoming changes.
Current HVAC Code Requirements Affecting Home Renovations
The State Building Code (SBC) applies to most buildings and some other structures, being newly constructed new, being altered or added to, or undergoing a change of use. In conjunction with the Codes and Standards Committee, the Office of the State Building Inspector (OSBI) establishes the building, electrical, mechanical, plumbing and energy code requirements of the SBC, necessary to promote the health and safety of the people of Connecticut. This means that even minor HVAC upgrades during home renovations may trigger compliance with current energy efficiency standards.
One of the most significant changes affecting HVAC systems involves electrical safety requirements. GFCI protection shall not be required for listed HVAC equipment. September 1, 2026 was removed from Exception No.2. This change means that GFCI protection not required for listed HVAC equipment, this exception expires September 1, 2026, requiring homeowners to plan accordingly for electrical upgrades to their HVAC systems after that date.
Energy Efficiency Standards Impacting HVAC Upgrades
Connecticut has implemented stricter energy efficiency requirements that directly affect HVAC system installations and upgrades. The Connecticut State Building Code has amended air leakage testing requirements from 3 ACH50 to 5 ACH50 for low-rise attached dwellings greater than 850 sq ft and to 6.5 ACH50 for dwellings less than 850 sq ft. It added an exception to duct leakage testing where an existing HVAC system is being modified.
For new construction and major renovations, new construction projects need to use ENERGY STAR-rated HVAC systems and appliances as mandatory requirements. The process of obtaining building permits in Connecticut requires builders to submit a Rescheck compliance report that demonstrates their designs meet the state’s elevated performance standards. This requirement extends to substantial home renovations involving HVAC system replacements.
Upcoming 2025-2026 Code Changes
Connecticut is actively preparing for the next generation of building codes. The Connecticut Code Amendment Subcommittee and Fire Prevention Code Advisory Committee have been preparing to adopt the 2025 Connecticut State Codes. They have been meeting twice a month since April 2024 to review the model code books, alongside the 2022 state code amendments and the public code change proposals received to determine the need for any changes to the Connecticut specific amendments.
The new codes will include the ICC 2024 model International Building Code, Existing Building Code, Energy Conservation Code, Mechanical Code, Plumbing Code, Residential Code, Fire Code, and Swimming Pool & Spa Code. These updates will likely introduce more stringent HVAC efficiency requirements and installation standards.
What This Means for Homeowners Planning HVAC Projects
For homeowners considering HVAC upgrades or renovations, timing is crucial. Projects that require permits must comply with codes in effect at the time of application. The new codes will apply to projects for which a permit is applied for after the effective date. This creates both opportunities and challenges for homeowners.
Current projects can still benefit from existing exceptions and requirements, but homeowners should consider future-proofing their installations. The Connecticut building code requires buildings to have continuous insulation, which means the insulation must extend without interruptions to prevent heat loss through structural elements and openings. The Rescheck calculations for Connecticut require builders to show both proper R-value amounts and proper installation methods for compliance.
Professional HVAC Services Are Essential
Given the complexity of Connecticut’s evolving building codes, working with qualified HVAC professionals is more important than ever. These requirements affect everything from system sizing and efficiency ratings to electrical connections and ductwork installation. Professional HVAC Services Fairfield County, CT providers understand both current regulations and upcoming changes, ensuring your investment complies with all applicable codes.
Qualified HVAC contractors can navigate the permitting process, ensure proper installation techniques meet code requirements, and help homeowners take advantage of available incentives. Connecticut offers substantial rebates for energy-efficient HVAC equipment. Heat pump installations can qualify for $250 per ton rebates, and high-efficiency systems often qualify for additional utility incentives through Energize Connecticut programs. Federal tax credits up to $3,200 annually are available for qualifying energy-efficient equipment installations.
Planning Your HVAC Project
Homeowners should consider several factors when planning HVAC renovations or upgrades. First, determine whether your project will trigger building code compliance requirements. Even seemingly minor modifications can require permits and code compliance if they involve electrical work, ductwork changes, or system replacements.
Second, consider the timing of your project relative to upcoming code changes. While current codes remain in effect through mid-2026, planning ahead can help you take advantage of current incentives while preparing for future requirements.
Finally, work with experienced local HVAC professionals who understand Connecticut’s specific requirements and can guide you through the permitting process. They can help ensure your project not only meets current codes but positions your home for long-term efficiency and compliance.
Connecticut’s building code changes represent a commitment to energy efficiency and safety, but they also create new challenges for homeowners. By understanding these requirements and working with qualified professionals, you can navigate the regulatory landscape while creating a more comfortable, efficient home that meets both current and future standards.