{
  "furnaces": [
    {
      "template": "DOE Ref Pre-1980",
      "equipment_type": "Warm Air Duct Furnaces",
      "fuel_type": "NaturalGas",
      "electric_power_phase": null,
      "minimum_capacity": 0.0,
      "maximum_capacity": 9999999999.0,
      "minimum_combo_unit_cooling_capacity": null,
      "maximum_combo_unit_cooling_capacity": null,
      "subtype": null,
      "start_date": "1919-09-09T00:00:00+00:00",
      "end_date": "2999-09-09T00:00:00+00:00",
      "minimum_annual_fuel_utilization_efficiency": null,
      "minimum_thermal_efficiency": 0.8,
      "minimum_combustion_efficiency": null,
      "standby_mode_power": null,
      "off_mode_power": null,
      "notes": null
    },
    {
      "template": "DOE Ref Pre-1980",
      "equipment_type": "Warm Air Furnace",
      "fuel_type": "NaturalGas",
      "electric_power_phase": null,
      "minimum_capacity": 0.0,
      "maximum_capacity": 9999999999.0,
      "minimum_combo_unit_cooling_capacity": null,
      "maximum_combo_unit_cooling_capacity": null,
      "subtype": null,
      "start_date": "1919-09-09T00:00:00+00:00",
      "end_date": "2999-09-09T00:00:00+00:00",
      "minimum_annual_fuel_utilization_efficiency": null,
      "minimum_thermal_efficiency": 0.8,
      "minimum_combustion_efficiency": null,
      "standby_mode_power": null,
      "off_mode_power": null,
      "notes": null
    },
    {
      "template": "DOE Ref Pre-1980",
      "equipment_type": "Warm Air Unit Heaters",
      "fuel_type": "NaturalGas",
      "electric_power_phase": null,
      "minimum_capacity": 0.0,
      "maximum_capacity": 9999999999.0,
      "minimum_combo_unit_cooling_capacity": null,
      "maximum_combo_unit_cooling_capacity": null,
      "subtype": null,
      "start_date": "1919-09-09T00:00:00+00:00",
      "end_date": "2999-09-09T00:00:00+00:00",
      "minimum_annual_fuel_utilization_efficiency": null,
      "minimum_thermal_efficiency": 0.8,
      "minimum_combustion_efficiency": null,
      "standby_mode_power": null,
      "off_mode_power": null,
      "notes": null
    }
  ]
}