{

"formulas": {
  "fdwr_formula": {
    "data_type": "formula",
    "refs": [
      "NECB2011_S_3.2.1.4(1)"
    ],
    "required_variables": [
      "hdd"
    ],
    "value": "( hdd <= 4000.0) ? 0.4 : ( hdd > 4000.0 and hdd < 7000.0 ) ? ( (2000.0 - 0.2 * hdd) / 3000.00) : 0.2;",
    "units": "ratio",
    "notes": "Requires hdd to be defined to be evaluated in code."
  }
}

}