{
  "benchmark": {
    "version": "1.0.0",
    "date": "2026-09-19",
    "name": "Greenhouse Heating Planning Benchmark",
    "url": "https://greenhouseverdicts.com/research/greenhouse-heating-benchmark/",
    "type": "Deterministic scenario analysis, not field measurements",
    "footprints": [
      [
        6,
        8
      ],
      [
        6,
        12
      ],
      [
        8,
        12
      ],
      [
        8,
        16
      ],
      [
        10,
        16
      ],
      [
        12,
        20
      ]
    ],
    "uFactors": [
      0.5,
      0.8,
      1.2
    ],
    "temperatureDifferencesF": [
      20,
      40,
      60
    ],
    "fixed": {
      "eaveFt": 6,
      "ridgeFt": 8,
      "airChangesPerHour": 1,
      "perimeterCoefficient": 0.8
    },
    "methodSource": "https://fieldreport.caes.uga.edu/publications/B792/greenhouses-heating-ventilation-and-cooling/",
    "contextSource": "https://www.umass.edu/agriculture-food-environment/greenhouse-floriculture/fact-sheets/fan-shutter-heat-loss-in-greenhouses",
    "limitations": [
      "Idealized symmetric gable geometry, not a particular kit or an approved structural design.",
      "U-factors are unassigned scenario inputs, not verified specifications for a material or manufacturer.",
      "Temperature differences are scenarios, not local weather observations or design temperatures.",
      "Peak steady-state thermal output is not electrical input, annual energy use, an operating bill or a heater recommendation.",
      "No solar gain credit, warm-up allowance, humidity-control load, thermal-curtain model, weather series or site-specific wind adjustment.",
      "The perimeter term is a simplified allowance, not a detailed floor/ground heat-transfer model.",
      "Use model-specific documentation, local requirements and qualified professionals for final installation."
    ]
  },
  "dataDictionary": {
    "widthFt": "Model width, ft",
    "lengthFt": "Model length, ft",
    "eaveFt": "Fixed eave height, ft",
    "ridgeFt": "Fixed ridge height, ft",
    "floorAreaFt2": "Width × length; ft²",
    "envelopeAreaFt2": "Gross roof + sidewalls + ends; no floor; ft²",
    "volumeFt3": "Enclosed gable volume; ft³",
    "perimeterFt": "2 × (width + length); ft",
    "uBtuPerHourFt2F": "Envelope U-factor; BTU/(h·ft²·°F); scenario input",
    "deltaF": "Inside-minus-outside temperature difference; °F",
    "airChangesPerHour": "Leakage air changes per HOUR",
    "perimeterCoefficient": "P in BTU/(h·ft·°F)",
    "transmissionBtuPerHour": "Envelope area × U × ΔT",
    "infiltrationBtuPerHour": "0.02 × volume × ACH × ΔT",
    "perimeterBtuPerHour": "Perimeter × P × ΔT",
    "totalBtuPerHour": "Sum of the three heat-loss terms; BTU/h",
    "thermalKw": "Useful heat output; total BTU/h ÷ 3412.142",
    "btuPerHourPerFloorFt2": "Total heat-loss rate divided by model floor area; not a universal sizing factor"
  },
  "rowCount": 54,
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      "uBtuPerHourFt2F": 0.5,
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      "infiltrationBtuPerHour": 134.4,
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      "totalBtuPerHour": 2959.2882040742384,
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      "btuPerHourPerFloorFt2": 153.3964425626941
    },
    {
      "id": "12x20-u1.2-dt20-ach1-p0.8",
      "widthFt": 12,
      "lengthFt": 20,
      "eaveFt": 6,
      "ridgeFt": 8,
      "floorAreaFt2": 240,
      "envelopeAreaFt2": 660.9822128134704,
      "volumeFt3": 1680,
      "perimeterFt": 64,
      "uBtuPerHourFt2F": 1.2,
      "deltaF": 20,
      "airChangesPerHour": 1,
      "perimeterCoefficient": 0.8,
      "transmissionBtuPerHour": 15863.573107523289,
      "infiltrationBtuPerHour": 672,
      "perimeterBtuPerHour": 1024,
      "totalBtuPerHour": 17559.57310752329,
      "thermalKw": 5.146202329071677,
      "btuPerHourPerFloorFt2": 73.16488794801371
    },
    {
      "id": "12x20-u1.2-dt40-ach1-p0.8",
      "widthFt": 12,
      "lengthFt": 20,
      "eaveFt": 6,
      "ridgeFt": 8,
      "floorAreaFt2": 240,
      "envelopeAreaFt2": 660.9822128134704,
      "volumeFt3": 1680,
      "perimeterFt": 64,
      "uBtuPerHourFt2F": 1.2,
      "deltaF": 40,
      "airChangesPerHour": 1,
      "perimeterCoefficient": 0.8,
      "transmissionBtuPerHour": 31727.146215046578,
      "infiltrationBtuPerHour": 1344,
      "perimeterBtuPerHour": 2048,
      "totalBtuPerHour": 35119.14621504658,
      "thermalKw": 10.292404658143354,
      "btuPerHourPerFloorFt2": 146.32977589602743
    },
    {
      "id": "12x20-u1.2-dt60-ach1-p0.8",
      "widthFt": 12,
      "lengthFt": 20,
      "eaveFt": 6,
      "ridgeFt": 8,
      "floorAreaFt2": 240,
      "envelopeAreaFt2": 660.9822128134704,
      "volumeFt3": 1680,
      "perimeterFt": 64,
      "uBtuPerHourFt2F": 1.2,
      "deltaF": 60,
      "airChangesPerHour": 1,
      "perimeterCoefficient": 0.8,
      "transmissionBtuPerHour": 47590.719322569865,
      "infiltrationBtuPerHour": 2016,
      "perimeterBtuPerHour": 3072,
      "totalBtuPerHour": 52678.719322569865,
      "thermalKw": 15.43860698721503,
      "btuPerHourPerFloorFt2": 219.4946638440411
    }
  ],
  "sensitivity": [
    {
      "label": "Baseline",
      "change": "8 × 12 ft; U 0.8; ΔT 40°F; 1 ACH; perimeter 0.8",
      "record": {
        "id": "8x12-u0.8-dt40-ach1-p0.8",
        "widthFt": 8,
        "lengthFt": 12,
        "eaveFt": 6,
        "ridgeFt": 8,
        "floorAreaFt2": 96,
        "envelopeAreaFt2": 363.3312629199899,
        "volumeFt3": 672,
        "perimeterFt": 40,
        "uBtuPerHourFt2F": 0.8,
        "deltaF": 40,
        "airChangesPerHour": 1,
        "perimeterCoefficient": 0.8,
        "transmissionBtuPerHour": 11626.600413439679,
        "infiltrationBtuPerHour": 537.6,
        "perimeterBtuPerHour": 1280,
        "totalBtuPerHour": 13444.20041343968,
        "thermalKw": 3.9401057791380545,
        "btuPerHourPerFloorFt2": 140.04375430666332
      },
      "changePercent": 0
    },
    {
      "label": "Lower U-factor only",
      "change": "U 0.8 → 0.5; other inputs unchanged",
      "record": {
        "id": "8x12-u0.5-dt40-ach1-p0.8",
        "widthFt": 8,
        "lengthFt": 12,
        "eaveFt": 6,
        "ridgeFt": 8,
        "floorAreaFt2": 96,
        "envelopeAreaFt2": 363.3312629199899,
        "volumeFt3": 672,
        "perimeterFt": 40,
        "uBtuPerHourFt2F": 0.5,
        "deltaF": 40,
        "airChangesPerHour": 1,
        "perimeterCoefficient": 0.8,
        "transmissionBtuPerHour": 7266.625258399798,
        "infiltrationBtuPerHour": 537.6,
        "perimeterBtuPerHour": 1280,
        "totalBtuPerHour": 9084.225258399798,
        "thermalKw": 2.6623233319128565,
        "btuPerHourPerFloorFt2": 94.62734644166456
      },
      "changePercent": -32.43015591080726
    },
    {
      "label": "More leakage only",
      "change": "1 → 2 air changes per hour; other inputs unchanged",
      "record": {
        "id": "8x12-u0.8-dt40-ach2-p0.8",
        "widthFt": 8,
        "lengthFt": 12,
        "eaveFt": 6,
        "ridgeFt": 8,
        "floorAreaFt2": 96,
        "envelopeAreaFt2": 363.3312629199899,
        "volumeFt3": 672,
        "perimeterFt": 40,
        "uBtuPerHourFt2F": 0.8,
        "deltaF": 40,
        "airChangesPerHour": 2,
        "perimeterCoefficient": 0.8,
        "transmissionBtuPerHour": 11626.600413439679,
        "infiltrationBtuPerHour": 1075.2,
        "perimeterBtuPerHour": 1280,
        "totalBtuPerHour": 13981.80041343968,
        "thermalKw": 4.097660769522394,
        "btuPerHourPerFloorFt2": 145.64375430666334
      },
      "changePercent": 3.998750267532314
    },
    {
      "label": "Lower perimeter coefficient only",
      "change": "Perimeter 0.8 → 0.4; other inputs unchanged",
      "record": {
        "id": "8x12-u0.8-dt40-ach1-p0.4",
        "widthFt": 8,
        "lengthFt": 12,
        "eaveFt": 6,
        "ridgeFt": 8,
        "floorAreaFt2": 96,
        "envelopeAreaFt2": 363.3312629199899,
        "volumeFt3": 672,
        "perimeterFt": 40,
        "uBtuPerHourFt2F": 0.8,
        "deltaF": 40,
        "airChangesPerHour": 1,
        "perimeterCoefficient": 0.4,
        "transmissionBtuPerHour": 11626.600413439679,
        "infiltrationBtuPerHour": 537.6,
        "perimeterBtuPerHour": 640,
        "totalBtuPerHour": 12804.20041343968,
        "thermalKw": 3.7525403143947935,
        "btuPerHourPerFloorFt2": 133.37708763999666
      },
      "changePercent": -4.760416985157523
    },
    {
      "label": "Smaller temperature difference only",
      "change": "ΔT 40°F → 20°F; other inputs unchanged",
      "record": {
        "id": "8x12-u0.8-dt20-ach1-p0.8",
        "widthFt": 8,
        "lengthFt": 12,
        "eaveFt": 6,
        "ridgeFt": 8,
        "floorAreaFt2": 96,
        "envelopeAreaFt2": 363.3312629199899,
        "volumeFt3": 672,
        "perimeterFt": 40,
        "uBtuPerHourFt2F": 0.8,
        "deltaF": 20,
        "airChangesPerHour": 1,
        "perimeterCoefficient": 0.8,
        "transmissionBtuPerHour": 5813.3002067198395,
        "infiltrationBtuPerHour": 268.8,
        "perimeterBtuPerHour": 640,
        "totalBtuPerHour": 6722.10020671984,
        "thermalKw": 1.9700528895690272,
        "btuPerHourPerFloorFt2": 70.02187715333166
      },
      "changePercent": -50
    }
  ]
}