Replacing a gas furnace in 2026 typically costs $3,800 to $8,000 installed for a standard-efficiency (80% AFUE) or mid-efficiency unit and $5,500 to $12,000 for a high-efficiency (95–98% AFUE) condensing furnace, with variable-speed blowers and modulating burners at the top of the range; venting changes, gas line work, ductwork condition and size push the number up. In North Carolina, where winters are mild and heat pump rebates are large, a furnace quote should always be compared against a heat pump or dual-fuel option before you sign.
Typical installed cost
| Furnace | Typical installed (2026) | Notes |
|---|---|---|
| 80% AFUE, single-stage | $3,800 – $6,500 | Metal flue; simplest swap |
| 80% AFUE, two-stage / variable blower | $4,500 – $8,000 | Better comfort, quieter |
| 95–96% AFUE condensing, single-stage | $5,500 – $9,000 | PVC venting, condensate drain |
| 96–98% AFUE modulating, variable-speed | $7,500 – $12,000 | Premium tier |
Add $500–$2,500 for new venting when moving from 80% to condensing, gas line changes, or electrical; add for duct repairs. Ranges reflect 2026 national pricing surveys and manufacturer guidance; NC labor sits near the national average.
What drives the price
Efficiency tier and staging; size (BTU input, which should come from a load calculation, not the old nameplate — furnaces are chronically oversized, which causes short cycling); venting (condensing furnaces need PVC intake/exhaust and a condensate drain, sometimes a pump); gas piping and electrical; ductwork; and whether the indoor coil for the AC or heat pump is replaced at the same time.
The North Carolina question
A furnace heats; it doesn’t cool. In our climate you’ll spend more on cooling than heating, and the state’s Energy Saver NC rebates go to heat pumps, not furnaces. If your AC is also aging, a heat pump replacing both may cost about the same as a furnace plus a new AC and comes with rebates. If you have gas and a furnace worth keeping, the smart move at the next cooling replacement is a heat pump paired with the furnace (dual-fuel). Heat pump vs furnace in NC, replace AC and furnace together?, and air handler vs furnace cover the trade-offs; heat pump cost has the numbers.
Getting quotes
Ask for the load calculation, model numbers, AFUE, staging, what’s included in venting and gas work, the permit, and the labor warranty. Furnace work in NC needs a contractor holding the H-2 (forced-air heating) class; every contractor on the North Carolina registry shows the license class and status we found.