80,000 BTU Gas Furnaces

It's a versatile size that suits many average-to-large homes, but the right fit depends on your climate and heat loss. Confirm with a load calculation rather than assuming, since it's often installed by default.

Yes — it's one of the most common and widely stocked residential capacities, which is why it comes in the full range of efficiency and staging options.

Both improve on single-stage comfort. Two-stage runs on low or high; modulating continuously fine-tunes output for the steadiest temperatures. Modulating costs more and delivers the most even, efficient heat.

In colder climates or where gas is expensive, a 90%+ condensing furnace pays back its premium through fuel savings. In milder climates, an 80% unit is a practical, lower-cost choice.