Furnace Replacement Cost Calculator

Installed, a mid-range gas furnace typically runs $3,000 to $6,000. High-efficiency models or jobs that include ductwork changes cost more.

In cold climates, the annual gas savings and available rebates typically recover the higher upfront cost within four to eight years.

Most gas furnaces reach 15 to 20 years with regular maintenance. Electric furnaces often last longer.

Sizing depends on square footage, climate zone, and insulation level. A licensed HVAC contractor runs a Manual J load calculation to get it right.

If your AC is also aging, replacing both at once saves $1,000 to $2,500 in combined labor and lets the contractor properly size and match the systems.

For a 2,000-square-foot home, a new furnace typically costs $2,500 to $5,500 installed, covering equipment and labor. The price varies by efficiency rating, brand, fuel type, local labor rates, and whether ductwork modifications are required. A 96% AFUE model costs more upfront but cuts monthly gas bills by 15 to 25 percent compared to an 80% unit. Two or three quotes from licensed HVAC contractors will give you a reliable price range for your specific home.

Yes. A 30-year-old furnace is 10 to 15 years past its expected lifespan and almost certainly running at 60 to 70% AFUE or worse. Upgrading to a modern high-efficiency model cuts gas consumption by 30 to 40 percent, removes the reliability risk of a system overdue for failure, and eliminates the carbon monoxide exposure risk from an aging heat exchanger. The energy savings alone recover a meaningful share of the replacement cost within 8 to 10 years.

Labor to install a furnace typically runs $800 to $2,000 in 2026, depending on your region, installation complexity, and whether ductwork or venting modifications are required. A straight swap of an existing forced-air system sits at the lower end; new gas lines, venting upgrades, or electrical work push it higher. Always ask for an itemized quote with parts and labor broken out separately. Comparing bids from licensed HVAC contractors is the most reliable way to confirm you are paying a fair rate.

Most gas furnaces last 15 to 20 years with regular maintenance; well-maintained premium units sometimes reach 25. Annual tune-ups and filter changes make the biggest difference. Once a furnace passes 18 to 20 years, the risk of costly breakdowns and efficiency decline increases noticeably. If yours is approaching that range, start budgeting for replacement and get an assessment from a licensed HVAC technician before the furnace makes the decision for you.