Natural gas Finance for a house. About 2 years ago a friends finance went out. They had bought this one off of here, but it wasn't the right type or the fitting wasn't right. I'm not completely sure. When you consider a gas furnace, quality and value are a given. You’re getting peace of mind with great features and a smart design at an affordable price. The 80G1E series furnace is ideal for new or replacement residential or commercial installations. These 80% efficient single stage natural gas ready furnaces have a 33 in. tall cabinet, are available in upflow/horizontal models, and downflow models