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    Best U-Factor and SHGC for Windows in Florida

    Data updated October 12, 2026.

    ENERGY STAR Version 7.0 places all of Florida in its Southern climate zone. ENERGY STAR windows there need a U-factor of 0.32 or lower and an SHGC of 0.23 or lower.

    Across Florida, in the GlassBase heating and cooling model, replacing a single-pane window with an ENERGY STAR window saves 598 kWh per window per year. Upgrading a double-pane window saves 421 kWh.

    What matters most for windows in Florida

    In Florida, most of the modeled saving comes from cooling: 553 kWh of cooling load against 45 kWh of heating load per window per year, for a single-pane to ENERGY STAR upgrade. SHGC measures how much solar heat the window lets in. A lower SHGC means less heat for the air conditioner to remove.

    Results vary inside the state; see the city table below.

    Modeled savings per window per year across Florida

    One window of 39 × 59 in (1 × 1.5 m), averaged over eight facing directions. Weather: 45 TMY3 weather stations.

    Upgrade Heating saved, kWh/yr Cooling saved, kWh/yr Total, kWh/yr Natural gas saved, therms/yr
    gas furnace    		 Heat pump + AC, $/yrGas furnace + AC, $/yr
    Single-pane → double-pane 451331781.8 1013
    Single-pane → ENERGY STAR (Southern) 455535981.8 3638
    Double-pane → ENERGY STAR (Southern) 14204210.0 2626

    Dollar figures use Florida average prices, not your utility's rate. Electricity $0.1524/kWh: Florida residential average, 2025. Source: U.S. EIA, Electric Power Monthly, Table 5.6.B, residential sector, year-to-date through December 2025, retrieved 2026-10-06. Natural gas $2.49/therm: Florida residential average, 2025. Source: U.S. EIA, Natural Gas Prices: price delivered to residential consumers, and heat content of natural gas delivered to consumers, 2025, retrieved 2026-10-06. Heat pump COP 3.2, air conditioner COP 2.5, gas furnace efficiency 85%.

    The single-pane and double-pane windows use values from the calculator's reference-window table; the ENERGY STAR window is at the Southern zone limits. kWh here measures heat, not electricity on a bill. Air leakage and the rest of the house are not modeled. Model version tmy3-hourly-iso13790/f4822a26309b, data run October 12, 2026. How the model works.

    Cities in Florida

    Modeled savings per window per year in Florida cities with a GlassBase page.

    CityENERGY STAR zoneTotal, kWh/yr
    single-pane → ENERGY STAR    		Total, kWh/yr
    double-pane → ENERGY STAR
    MiamiSouthern656484
    OrlandoSouthern574402
    JacksonvilleSouthern511339
    Fort LauderdaleSouthern659483
    TampaSouthern625443
    HollywoodSouthern675494
    West Palm BeachSouthern639471
    Pompano BeachSouthern641469
    Saint PetersburgSouthern579406
    HialeahSouthern657480
    KissimmeeSouthern560395
    TallahasseeSouthern559350
    Fort MyersSouthern658478
    LakelandSouthern579397
    PensacolaSouthern518336
    OcalaSouthern602403
    Port Saint LucieSouthern535374
    Boca RatonSouthern641469
    GainesvilleSouthern553360
    HomesteadSouthern687498
    Lake WorthSouthern639471
    ClearwaterSouthern595412
    Boynton BeachSouthern639471
    MelbourneSouthern553404
    Saint AugustineSouthern516345
    Spring HillSouthern627445
    Vero BeachSouthern581423
    Delray BeachSouthern639471
    Panama CitySouthern513324
    Daytona BeachSouthern557390
    Saint CloudSouthern559395
    LargoSouthern595412
    Port CharlotteSouthern664482
    OviedoSouthern592411
    North PortSouthern594423
    BrooksvilleSouthern609420
    Deerfield BeachSouthern641469
    Panama City BeachSouthern526337
    IndiantownSouthern535374
    Indian Rocks BeachSouthern595412

    Payback of each upgrade in Florida

    Calculate savings for your ZIP code

    Compare states: window energy savings by state.

    Frequently asked questions

    Which ENERGY STAR climate zone is my home in?

    All of Florida is in the Southern zone. The ENERGY STAR climate zone finder gives the zone for an address.

    How much can new windows save in Florida?

    Across Florida, for a single-pane to ENERGY STAR upgrade, the GlassBase heating and cooling model saves 598 kWh per window per year. At Florida's 2025 average prices from the U.S. Energy Information Administration (EIA), the single-pane to ENERGY STAR upgrade is worth about $36 per window per year with a heat pump. Results differ from place to place; use the calculator for your ZIP code.

    Is the ENERGY STAR zone the same as the building code climate zone?

    No. ENERGY STAR uses four zones of its own, assigned by state and county. Building energy codes use the IECC climate zones, a separate map with its own window requirements. A window can meet one and not the other, so check both if your project needs a permit.