Goodman Furnaces

Goodman gas furnaces give you name-brand heating at direct prices — the same 80%, 92%, and 96% AFUE furnaces contractors install every day, many with R-32-ready control boards, shipped factory-fresh to your door. Every furnace is covered by Goodman’s warranty (10-year parts limited warranty when registered after installation) and backed by our price-match guarantee, free shipping over $99, and 0% APR financing with Affirm. Pair one with a Goodman coil and condenser for a complete matched system. Not sure what size you need? Our free sizing tool matches your square footage and climate to the right furnace in about two minutes.

Shop Goodman gas furnaces by size (BTU)

Furnaces are sized by BTU heat input — the higher the number, the more heat the furnace can produce (actual heat delivered is the BTU input times the AFUE efficiency). As a rough starting point in a moderate climate, figure somewhere around 30–45 BTU of input per square foot, but insulation, ceiling height, windows, ductwork, and how cold your winters get all move that number, so confirm with the sizing tool or a quick call before you buy.

40,000 BTU Goodman Furnaces

The smallest size — right for small homes, additions, condos, and mild climates. As a rough guide, suits homes up to around 1,000 sq ft, depending on climate and insulation. See all 40,000 BTU Goodman furnaces → Popular in stock: GR9S800403ANA (80% AFUE), GR9S960403ANA (96% AFUE).

60,000 BTU Goodman Furnaces

A common fit for smaller and well-insulated homes, or a right-sized replacement for an aging 60K unit. As a rough guide, suits homes around 1,000–1,500 sq ft, depending on climate and insulation. See all 60,000 BTU Goodman furnaces → Popular in stock: GR9S800603ANA (80% AFUE), GD9S960603BN (96% AFUE).

80,000 BTU Goodman Furnaces

The most common residential furnace size — fits the majority of single-family homes. As a rough guide, suits homes around 1,500–2,000 sq ft, depending on climate and insulation. See all 80,000 BTU Goodman furnaces → Popular in stock: GR9S800804CNA (80% AFUE), GD9S960804CN (96% AFUE).

100,000 BTU Goodman Furnaces

For larger homes and colder climates that need more heat than an 80K furnace delivers. As a rough guide, suits homes around 2,000–2,500 sq ft, depending on climate and insulation. See all 100,000 BTU Goodman furnaces → Popular in stock: GR9S801005CNA (80% AFUE), GD9S961005CN (96% AFUE).
Need more capacity? We also stock 120,000 BTU Goodman furnaces for the largest or coldest-climate homes. Between two sizes, or matching a furnace to an existing coil and air handler? Run the free sizing tool or call (877) 843-4822 — a real person picks up. We also price-match any legitimate competitor.

Quick sizing guide

Furnaces are sized by heating BTU, not tonnage — roughly 30–60 BTU per square foot depending on your winters. Our free sizing tool does the math for your home and climate.

Jump to your size: 40,000 BTU · 60,000 BTU · 80,000 BTU (the workhorse size for most 1,800–2,400 sq ft homes) · 100,000 BTU. Available in 80% and 96%+ AFUE efficiencies, single-stage to modulating.

Free shipping on every furnace — and the price in your cart may be lower than the one we’re allowed to advertise.