High-efficiency furnace cost
A high-efficiency (condensing) gas furnace with 90% to 95% AFUE costs $5,200 to $8,800 installed, and 96%+ models cost $7,500 to $12,000. That's roughly $1,500 to $5,000 more than a standard 80% furnace.
Quick answer
$5,200 – $12,00090%+ AFUE gas furnace, installed
High-efficiency gas furnaces cost $5,200 to $12,000 installed. A standard 80% furnace starts at about $3,800, and premium modulating brands can top $13,500.
Cost by AFUE rating
| AFUE | Unit price | Installed |
|---|---|---|
| 80% – 89% (standard) | $700 – $1,800 | $3,800 – $6,200 |
| 90% – 95% (high efficiency) | $1,500 – $3,700 | $5,200 – $8,800 |
| 96%+ (highest efficiency) | $2,800 – $6,200 | $7,500 – $12,000 |
How much you save
| Annual heating bill at 80% | At 92% AFUE | At 96% AFUE |
|---|---|---|
| $800 | save about $105 | save about $135 |
| $1,200 | save about $155 | save about $200 |
| $1,800 | save about $235 | save about $300 |
Savings = bill × (1 − old AFUE ÷ new AFUE). Actual savings depend on gas prices and use.
If a 96% furnace costs $2,500 more than an 80% model and saves $200 a year, it pays back in about 12 years, within a furnace's 15- to 25-year life. In warm climates with small heating bills, an 80% furnace is often the better buy.
Venting and installation differences
Condensing furnaces vent through PVC pipe out a side wall or roof and need a condensate drain (and sometimes a pump). If your old furnace vented into a shared chimney with a water heater, the water heater may need a chimney liner ($900 to $3,800). Ask the contractor to include all venting in the quote.
Rebates
The federal 25C credit (up to $600 for qualifying furnaces) ended for systems installed after 2025. Some gas utilities still offer $100 to $500 rebates for 95%+ AFUE furnaces; see HVAC tax credits and rebates in 2026.
How to get a fair quote
- Get at least three written quotes that list the brand, model number, size (tons or BTU) and efficiency rating.
- Ask whether the price includes permits, removal of the old unit, refrigerant, a new thermostat and any duct or electrical work.
- Ask for a load calculation (Manual J) instead of matching the old unit's size by default.
- Compare labor warranties (1 to 10 years) as well as the manufacturer's parts warranty, and register the equipment.
- Schedule non-urgent work in spring or fall, when contractors are less busy and more willing to discount.
Frequently asked questions
Is a high-efficiency furnace worth the extra cost?
In cold climates with high heating bills, usually yes; payback is often 8 to 15 years. In warm climates, the savings may not justify the extra cost.
What AFUE is considered high efficiency?
Generally 90% AFUE and above. The most efficient condensing gas furnaces reach about 97% to 98.5% AFUE.
Why do high-efficiency furnaces need PVC vents?
They extract so much heat that exhaust gases are cool and acidic, so they vent through plastic pipe and drain condensation.
Sources
Prices are national averages and typical ranges from published cost data. Your price depends on your home, region, equipment and contractor, so get several written quotes. Heat & Air Costs is not an HVAC contractor; read our disclaimer.