Here is roughly what a new furnace costs to install, using current national averages. Goodman offers both standard and high-efficiency models, so a Goodman install can land anywhere in the ranges below depending on the model you choose.
| Furnace type | Typical installed cost (U.S. average) |
| Standard-efficiency (80-83% AFUE) | $3,800 - $6,000 |
| High-efficiency (90-98% AFUE) | $6,000 - $10,000 |
National averages from HomeAdvisor and Angi (2026): gas furnace installation runs about $3,800 to $10,000 (up to $12,000 for premium modulating units), and the furnace itself is 50-75% of the project. Your Long Island price depends on size, efficiency, ductwork and venting.
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