Florida Energy Code Compliance: The 2023 FBC-EC (8th Edition) Explained

Florida's hot, humid climate makes energy efficiency — especially cooling and moisture control — central to how buildings are designed and permitted. If you're building in the Sunshine State, here's how the energy code works and the routes you have to demonstrate compliance.

What is the Florida energy code?

Energy requirements are set by the Florida Building Code — Energy Conservation (FBC-EC). The current 8th Edition (2023) is based on the 2021 International Energy Conservation Code (IECC) with Florida-specific amendments, and has been in effect since the end of 2023. It covers the building envelope, HVAC, lighting, water heating and power systems for both residential and commercial buildings.

Why Florida's climate drives the code

Most of Florida sits in hot-humid climate zones 1 and 2, where cooling — not heating — dominates energy use. That shifts the emphasis onto window performance (especially SHGC to limit solar heat gain), envelope tightness, duct sealing, efficient cooling equipment and humidity control. Notably, in Climate Zone 2 new homes complying via the prescriptive method are not permitted to use electric-resistance heating.

The compliance paths

• Prescriptive — meet the specific insulation, glazing, SHGC, HVAC and envelope requirements listed in the code.
• Performance (energy modeling) — model the building to show it meets or beats the code's energy target, allowing design trade-offs.
• ERI path (residential) — meet a Florida-modified Energy Rating Index score, broadly aligned with the 2021 IECC ERI framework.
• Commercial — may also comply via ASHRAE 90.1-2019 (with Florida amendments).

The tools and documents

Residential performance and ERI compliance in Florida is typically demonstrated with EnergyGauge (the state's widely used tool), producing the required compliance forms. Commercial projects use COMcheck or whole-building energy modeling against the ASHRAE 90.1 path. The performance and ERI routes give designers the flexibility that the prescriptive checklist doesn't.

What this means for project teams

For anything other than a simple prescriptive build, the performance or ERI path usually delivers a better, more flexible result — and it lets you optimize glazing, shading and cooling early, where it matters most in Florida's climate. Model during design, not after.

This article is general guidance and reflects information available at the time of writing. Florida Building Code editions and amendments change over time — always confirm current requirements with the Florida Building Commission and your local building department.