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Gas Furnaces

Gas Furnaces FAQs

How much does it cost to replace a gas furnace?

Our smallest and most affordable gas furnaces cost around $600, while more efficiency-maximizing options can cost as much as $5,000. No matter your financial situation, a gas furnace is an important investment. Be sure to browse the benefits of different furnaces before committing to an option — or ask a technician for help finding the furnace that’s right for you. 

Note: It is recommended that you have your gas furnace inspected at least once a year by a licensed technician; a furnace's normal lifetime should be between 15 and 30 years. 

How does a gas furnace work?

Gas furnaces work by burning a flammable gas, like propane or natural gas. The heat is then conducted through a heat exchanger, which warms the air. Warm air is forced through ductwork and then blown into the home or office, warming the space. 

Those interested in a gas furnace for their space can browse our 80,000 BTU furnaces and 60,000 BTU furnaces, which are comprehensive heating options. If you’d prefer to see further options, consider finding an electric furnace for your home. 

What size gas furnace do I need?

The size of the furnace you need depends on a few factors. These include:

  • Square footage. You can calculate square footage by multiplying the length and width of the rooms in your home, and multiplying them. For multiple rooms, find the square footage of each, then add them together. 

  • Insulation. Homes with newer insulation might not require the same heating capacity as ones with poorer insulation. 

  • Doors and windows. The more doors and windows there are in a space, the more energy it takes to warm it. 


Climate. Climate is one of the biggest factors to consider. Colder climates will require higher-BTU furnaces to effectively warm a space.

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We believe that it shouldn't be difficult to find the right furnace for your house. Our gas furnaces come in a wide range of sizes and styles to suit a variety of needs. Browse our selection of gas furnaces to find the most energy-efficient option for heating your home or office.

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Gray upright Goodman 40,000 BTU 96% efficiency ultra-low NOx upflow, horizontal gas furnace model GMES960403BU on white background
Goodman 40,000 BTU 96% Efficiency Ultra-Low NOx Upflow, Horizontal Gas Furnace Model GMES960403BU
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Gray upright Goodman 60,000 BTU 96% Efficiency Ultra-Low NOx Upflow, Horizontal Gas Furnace Model GMES960603BU on white background
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Gray upright Goodman 80,000 BTU 96% Efficiency Ultra-Low NOx Upflow, Horizontal Gas Furnace Model GMES960805CU on white background
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Gray upright Goodman 40,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES960403AN on white background
Goodman 40,000 BTU gas furnace GMES960403AN
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Gray upright Goodman 60,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES960603BN on white background
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Gray upright Goodman 80,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES960803BN on white background
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Gray upright Goodman 80,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES960804CN on white background
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Gray upright Goodman 80,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES960805CN on white background
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Gray upright Goodman 100,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES961005CN on white background
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Gray upright Goodman 120,000 BTU 96% Efficiency Upflow, Horizontal Gas Furnace Model GMES961205DN on white background
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Gray upright Goodman 40,000 BTU 96% Efficiency Downflow, Horizontal Gas Furnace Model GCES960403BN on white background
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Gray upright Goodman 60,000 BTU 96% Efficiency Downflow, Horizontal Gas Furnace Model GCES960603BN on white background
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Gray upright Goodman 80,000 BTU 96% Efficiency Downflow, Horizontal Gas Furnace Model GCES960804CN on white background
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Gray upright Goodman 100,000 BTU 96% Efficiency Downflow, Horizontal Gas Furnace Model GCES961005CN on white background
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Gray upright Goodman 120,000 BTU 96% Efficiency Downflow, Horizontal Gas Furnace Model GCES961205DN on white background
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Gray upright Goodman 40,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES920403AN on white background
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Gray upright Goodman 60,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES920603BN on white background
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Gray upright Goodman 80,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES920803BN on white background
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Gray upright Goodman 80,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES920804CN on white background
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Gray upright Goodman 80,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES920805CN on white background
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Gray upright Goodman 100,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES921004CN on white background
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Gray upright Goodman 100,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES921005CN on white background
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Gray upright Goodman 120,000 BTU 92% Efficiency Upflow, Horizontal Gas Furnace Model GMES921205DN on white background
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Gray upright Goodman 40,000 BTU 80% Efficiency Upflow, Horizontal Gas Furnace Model GMEC800403AN on white background
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