Furnaces that heat directly, withoutusing steam or hot water (similar to a residential furnace)

{
  "id": "MLC-T-ENE-000881",
  "term": "Furnaces that heat directly, withoutusing steam or hot water (similar to a residential furnace)",
  "field": "Energy",
  "definition": "Furnaces burn natural gas, fuel oil, propane/ butane (bottled gas), or electricity to warm the air. The warmed air is then distributed throughout the building through ducts. Many people use the words \"boilers\" and \"furnaces\" interchangeably. They are not the same. We mean that warm air is produced directly by burning some fuel. Warm-air furnaces typically rely on air ducts to carry the warm air throughout the building. Warm-air furnaces are often built in combination with central air-conditioning systems, so that they can use the same air ducts for either heating or air-conditioning (depending on the season). Other terms for describing this type of equipment include \"central system,\" \"split system,\" and \"forced air/forces air furnace.\"",
  "references": [
    "EIA Glossary"
  ],
  "url": "https://mlchart.com/terminology/energy/furnaces-that-heat-directly-withoutusing-steam-or-hot-water-similar-to-a-furnace/"
}