How Much Does Furnace Replacement Cost?
Furnace replacement costs vary significantly based on efficiency rating, fuel type, system size, and local labor. This guide gives you the numbers and the framework to evaluate what contractors quote you.
Furnace Replacement Cost Ranges (2026)
Costs include equipment and installation. Venting modifications, electrical upgrades, or fuel line work add to the total.
What Affects Furnace Replacement Cost
- AFUE efficiency rating: 80% AFUE is standard; 95-96% AFUE is high-efficiency. The high-efficiency models require a different venting approach (PVC pipe rather than metal flue) and condensate drainage. If your home does not have the right infrastructure, venting modification adds $500-$1,500.
- Fuel type: Gas furnaces are generally the most economical to operate in areas with natural gas access. Propane and oil have higher fuel costs. Electric resistance heating has lower equipment cost but higher operating cost in most markets.
- System size: Furnace capacity is rated in BTUs. Most homes need 40,000-100,000 BTU. A contractor should perform a Manual J load calculation to determine correct sizing -- oversizing is a common mistake that causes comfort problems and shortens equipment life.
- Brand and features: Two-stage and modulating furnaces cost $500-$1,500 more than single-stage but provide better comfort and efficiency. Variable-speed blowers improve air circulation and humidity control.
When to Replace vs. Repair
A furnace over 15 years old that needs a major repair (heat exchanger, blower motor, control board) is usually a better candidate for replacement. Younger furnaces with minor component failures (igniter, flame sensor, capacitor) are usually worth repairing. A cracked heat exchanger is always a replacement trigger regardless of age -- it is a safety issue.
Frequently Asked Questions
- What is the average cost to replace a furnace?
- Most homeowners pay $3,000-$6,000 for a high-efficiency gas furnace installed. Standard efficiency (80% AFUE) models run $2,000-$4,000 installed. Costs are higher if venting modifications, gas line work, or electrical upgrades are required.
- How long does furnace installation take?
- A straightforward furnace replacement typically takes 4-8 hours. If new venting is required (switching from 80% to 96% AFUE), add time for PVC venting and condensate drainage installation.
- Is a high-efficiency furnace worth the extra cost?
- In climates with cold winters and high natural gas rates, yes. A 96% AFUE furnace can save $200-$500 per year versus an 80% model, with payback in 5-8 years. In mild climates with short heating seasons, the payback period is longer and the financial case is less clear.
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