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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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80AF1UH045P12A
80AF1UH045P12A Aire-Flo 80% AFUE 45,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161841

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Price: $969.99

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80AF1DF045P12A
80AF1DF045P12A Aire-Flo 80% AFUE 45,000 BTU Downflow (Counterflow) 1-Stage Multi-Speed Gas Furnace

Item #: 20161852

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Price: $979.99

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80AF1UH070P12A
80AF1UH070P12A Aire-Flo 80% AFUE 70,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161842

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Price: $998.95

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80AF1DF070P12A
80AF1DF070P12A Aire-Flo 80% AFUE 70,000 BTU Downflow (Counterflow) 1-Stage Multi-Speed Gas Furnace

Item #: 20161853

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Price: $1,009.98

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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: $1,010.00

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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: $1,026.00

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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: $1,027.00

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80AF1UH090P12B
80AF1UH090P12B Aire-Flo 80% AFUE 90,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161843

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Price: $1,029.98

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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: $1,031.00

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GCSS960804CN
GCSS960804CN Goodman 96% AFUE 80,000 BTU Downflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016424

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Price: $1,039.00

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80AF1UH090P16B
80AF1UH090P16B Aire-Flo 80% AFUE 90,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161844

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Price: $1,039.98

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80AF1UH090P16BL
80AF1UH090P16BL Aire-Flo 80% AFUE 90,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace LowNox Rated (for California Only)

Item #: 20161850

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Price: $1,039.98

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80AF1DF090P16B
80AF1DF090P16B Aire-Flo 80% AFUE 90,000 BTU Downflow (Counterflow) 1-Stage Multi-Speed Gas Furnace

Item #: 20161854

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Price: $1,059.99

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80AF1UH110P16C
80AF1UH110P16C Aire-Flo 80% AFUE 110,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161845

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Price: $1,069.99

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80AF1UH045P12AL
80AF1UH045P12AL Aire-Flo 80% AFUE 45,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace LowNox Rated (for California Only)

Item #: 20161848

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Price: $1,069.99

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GMEC960402BN
GMEC960402BN Goodman 96% AFUE 40,000 BTU Upflow/Horizontal 2-Stage ECM Multi-Speed Gas Furnace

Item #: 2016410

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Price: $1,073.00

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GMSS960805CN
GMSS960805CN Goodman 96% AFUE 80,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016419

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Price: $1,079.00

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80AF1DF110P20C
80AF1DF110P20C Aire-Flo 80% AFUE 110,000 BTU Downflow (Counterflow) 1-Stage Multi-Speed Gas Furnace

Item #: 20161855

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Price: $1,079.99

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GMSS921205DN
GMSS921205DN Goodman 92% AFUE 120,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016434

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Price: $1,087.00

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80AF1UH110P20C
80AF1UH110P20C Aire-Flo 80% AFUE 110,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161846

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Price: $1,089.99

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80AF1UH070P12AL
80AF1UH070P12AL Aire-Flo 80% AFUE 70,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace LowNox Rated (for California Only)

Item #: 20161849

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Price: $1,099.98

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80AF1UH110P20CL
80AF1UH110P20CL Aire-Flo 80% AFUE 110,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace LowNox Rated (for California Only)

Item #: 20161851

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Price: $1,099.98

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GMEC960603BN
GMEC960603BN Goodman 96% AFUE 60,000 BTU Upflow/Horizontal 2-Stage ECM Multi-Speed Gas Furnace

Item #: 2016411

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Price: $1,118.00

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GMSS961005CN
GMSS961005CN Goodman 96% AFUE 100,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016420

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Price: $1,128.00

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GMVC80604BN
GMVC80604BN Goodman 80% AFUE 60,000 BTU Upflow/Horizontal 2-Stage Variable Speed Gas Furnace

Item #: 2016435

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Price: $1,136.00

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80AF1UH135P20D
80AF1UH135P20D Aire-Flo 80% AFUE 135,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161847

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Price: $1,139.98

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92AF1DF045P12B
92AF1DF045P12B Aire-Flo 92.1% AFUE 45,000 BTU Downflow (Counterflow) 1-Stage Multi-Speed Gas Furnace

Item #: 20161838

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Price: $1,147.99

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92AF1UH045P08B
92AF1UH045P08B Aire-Flo 92.1% AFUE 45,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161830

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Price: $1,149.99

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GCSS961005CN
GCSS961005CN Goodman 96% AFUE 100,000 BTU Downflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 2016425

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Price: $1,164.00

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92AF1UH045P12B
92AF1UH045P12B Aire-Flo 92.1% AFUE 45,000 BTU Upflow/Horizontal 1-Stage Multi-Speed Gas Furnace

Item #: 20161831

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Price: $1,167.99

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