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What is a Gas Furnace?

A gas furnace is a forced home air heating system, typically used in the colder states; also known as a home furnace. A gas furnace converts gas to heat and is used to keep the circulation of indoor air, warm and comfortable for living conditions. Before understanding how a gas furnace works, lets take some time to know the parts that make up a furnace. A gas furnace is divided into three parts:

  1. Burner, heat exchanger, vent and draft inducer
  2. Safety devices and controls
  3. Blower and air movement

How does a Gas Furnace work?

A gas furnace reacts to a drop in indoor air temperature. When the air temperature drops below the programmed setting on a thermostat. The heart of a gas furnace is the burner, controlled by a thermostat. When the indoor air temperature falls below a certain point, the thermostat alerts the gas furnace; the furnace then combines air and fuel and the mixture gets ignited by an electronic igniter. Then the combusted, hot gas, begins to rise through the heat exchanger situated above the burner and heats the air, which is circulated throughout the house. And, the remaining exhaust exits the gas furnace from a vent, which is let outside the house.

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GMS80403AN
GMS80403AN Goodman 80% AFUE 40,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016454

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Price: $499.00

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GMS80604BN
GMS80604BN Goodman 80% AFUE 60,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016456

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Price: $532.00

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GMH80603AN
GMH80603AN Goodman 80% AFUE 60,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016442

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Price: $574.00

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GMH80604BN
GMH80604BN Goodman 80% AFUE 60,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016443

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Price: $585.00

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GMS80603AN
GMS80603AN Goodman 80% AFUE 60,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016455

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Price: $589.00

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GMS80805CN
GMS80805CN Goodman 80% AFUE 80,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016458

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Price: $599.00

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GMH80803BN
GMH80803BN Goodman 80% AFUE 80,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016444

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Price: $604.00

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GMH80403AN
GMH80403AN Goodman 80% AFUE 40,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016441

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Price: $615.00

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GMH80804BN
GMH80804BN Goodman 80% AFUE 80,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016445

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Price: $618.00

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GMS81005CN
GMS81005CN Goodman 80% AFUE 100,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016459

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Price: $629.00

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GMH80805CN
GMH80805CN Goodman 80% AFUE 80,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016446

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Price: $638.00

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GMH81005CN
GMH81005CN Goodman 80% AFUE 100,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016447

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Price: $668.00

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GMSS920402BN
GMSS920402BN Goodman 92% AFUE 40,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016427

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Price: $691.00

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GMS81205DN
GMS81205DN Goodman 80% AFUE 120,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016460

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Price: $695.00

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GMSS920603BN
GMSS920603BN Goodman 92% AFUE 60,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016428

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Price: $714.00

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GMH81205DN
GMH81205DN Goodman 80% AFUE 120,000 BTU Upflow/Horizontal 2-Stage Multi-Speed Gas Furnace

Item #: 2016448

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Price: $751.00

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GDH80403AN
GDH80403AN Goodman 80% AFUE 40,000 BTU Downflow 2-Stage Multi-Speed Gas Furnace

Item #: 2016450

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Price: $752.00

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GMSS960402BN
GMSS960402BN Goodman 96% AFUE 40,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016415

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Price: $768.00

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GMSS920803BN
GMSS920803BN Goodman 92% AFUE 80,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016429

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Price: $782.00

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GDH80603AN
GDH80603AN Goodman 80% AFUE 60,000 BTU Downflow 2-Stage Multi-Speed Gas Furnace

Item #: 2016451

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Price: $782.00

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GCSS960402BN
GCSS960402BN Goodman 96% AFUE 40,000 BTU Downflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016422

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GMSS960603BN
GMSS960603BN Goodman 96% AFUE 60,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016416

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Price: $798.00

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GCSS960603BN
GCSS960603BN Goodman 96% AFUE 60,000 BTU Downflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016423

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GMSS920804CN
GMSS920804CN Goodman 92% AFUE 80,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016430

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GMSS960803BN
GMSS960803BN Goodman 96% AFUE 80,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016417

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Price: $843.00

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GDH80804BN
GDH80804BN Goodman 80% AFUE 80,000 BTU Downflow 2-Stage Multi-Speed Gas Furnace

Item #: 2016452

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Price: $844.00

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GMSS921004CN
GMSS921004CN Goodman 92% AFUE 100,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016432

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Price: $916.00

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GMSS921005CN
GMSS921005CN Goodman 92% AFUE 100,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016433

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Price: $930.00

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GMSS960804CN
GMSS960804CN Goodman 96% AFUE 80,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016418

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Price: $931.00

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GMEC960302BN
GMEC960302BN Goodman 96% AFUE 30,000 BTU Upflow/Horizontal 2-Stage ECM Multi-Speed Gas Furnace

Item #: 2016409

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Price: $935.00

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