Lo.ng for a high quality, reliable furnace? Check out our line of oil and gas furnaces that Lennox Residential has to offer..Condensing. The fourth category of furnace is the high efficiency, or condensing furnace. High efficiency furnaces can achieve from to fuel efficiency..M Series Oil Gas Intertherm engineered these furnaces for ease of installation as well as high efficiency in manufactured or modular homes. Cabinet insulation .Lennox ELV two stage gas furnace uses a variable s.d motor that reduces electrical use by two thirds, compared to a standard motor..
The ENERGY STAR Most Efficient designation recogni. The modulating multi stage gas valves allow the furnace to operate on a quieter low fire . blower provide precise comfort, quiet operating sounds, and high energy savings .. Furnaces have become more energy efficient over the years. A gas furnace made in the early s typi.y has an AFUE of about percent. The lowest efficiency allowed by law for new gas furnaces is percent, and some news achieve percent, near total efficiency..We purchased an EL high efficiency gas furnace to replace our aging Lennox gas furnace. What sold us on this unit was the simplicity and efficiency, as well .