Furnace Replacement Cost: Typical Ranges by Efficiency and Fuel
Furnace replacement cost depends on efficiency, fuel, venting, ducts and access. See typical industry ranges for mid-efficiency, high-efficiency and oil furnaces, hidden costs and how to compare quotes.
Furnace replacement cost is the total price to remove an old furnace and install a new one, including equipment, venting, labor and any duct or fuel-line changes. Typical industry ranges for common projects:
- Mid-efficiency gas furnace (80% AFUE): commonly runs about $4,000 to $7,500 installed.
- High-efficiency condensing gas furnace (95%+ AFUE): typically ranges from about $5,500 to $11,000.
- Oil furnace: commonly runs about $6,000 to $10,000, more if the tank or chimney needs work.
- Furnace plus new central AC: often about $10,000 to $18,000 together.
Efficiency, venting and the condition of your ducts drive most of the difference. This guide is part of our furnace and boiler replacement in Massachusetts guide.
Key Takeaways
- Efficiency tier sets the base price. Condensing furnaces cost more but burn less fuel.
- Venting changes add up. Moving from a chimney to PVC venting, or relining a chimney, changes cost.
- Ducts matter. Leaky or undersized ducts may need repair for the new furnace to perform.
- Sizing affects price and comfort. A load calculation often allows a smaller unit than the old one.
- Get itemized quotes. Compare equipment, venting, ductwork and removal line by line.
What Drives Furnace Replacement Cost?
| Factor | Why it matters | Effect on price |
|---|---|---|
| Efficiency (AFUE) | Condensing units have extra heat exchangers and controls | High |
| Fuel type | Gas, oil and propane equipment differ in cost | Medium |
| Venting | PVC venting, chimney liners or new flue pipe | Medium |
| Blower type | Variable-speed ECM blowers cost more | Medium |
| Ductwork | Sealing, repairs or resizing | Low to high |
| Access | Tight closets, attics or crawlspaces add labor | Low to medium |
| Size (BTU) | Larger homes need larger units | Low to medium |
Want a real number instead of a range? Request a written furnace replacement estimate and we will itemize equipment, venting and duct work.
Furnace Cost by Efficiency Level
Per DOE's guide to furnaces and boilers, older low-efficiency systems often run at 56% to 70% AFUE, mid-efficiency systems at about 80% to 83%, and high-efficiency condensing systems at 90% to 98.5%.
| Efficiency tier | Typical AFUE | Venting | Typical installed range |
|---|---|---|---|
| Mid-efficiency gas | 80% | Chimney or metal flue | About $4,000 to $7,500 |
| High-efficiency gas | 95% to 98% | PVC through the wall or roof | About $5,500 to $11,000 |
| Oil furnace | About 83% to 87% | Chimney with liner | About $6,000 to $10,000 |
ENERGY STAR certified furnaces for northern states must reach at least 95% AFUE for gas and 85% AFUE for oil. As of 2026, a DOE rule set to take effect in late 2028 will raise the minimum for most new gas furnaces to 95% AFUE, which narrows the choice going forward.
Is a High-Efficiency Furnace Worth the Extra Cost?
In Massachusetts, usually yes for gas furnaces. Long heating seasons give a 95% furnace plenty of hours to earn back its higher price compared with an 80% unit. Payback depends on how much gas you burn and future gas prices.
- Worth it: larger homes, long heating seasons, plans to stay several years.
- Less clear: small, tight homes with low gas use, or venting that is hard to route.
Hidden Costs to Ask About
- Chimney liner: may be needed when a mid-efficiency furnace or water heater shares an old masonry chimney.
- Orphaned water heater: if the furnace leaves the chimney, the water heater may need its own venting fix.
- Condensate drain or pump: required for condensing furnaces.
- Duct repairs: sealing leaks or fixing undersized returns.
- Gas line or oil line updates.
- Permits and inspections.
- Old equipment removal.
Repair or Replace First?
If you are still deciding, read furnace repair or replace. A common rule says replace when age times repair cost tops about $5,000. Safety problems like a cracked heat exchanger usually settle it.
Furnace vs Heat Pump Cost
Many homeowners replacing a furnace also price a heat pump or a dual-fuel setup. A heat pump replaces both the furnace and the AC, and homeowners may qualify for Mass Save rebates on qualifying models. Check masssave.com for current amounts. Compare the options in heat pump vs furnace and see typical ranges in heat pump cost in Massachusetts.
Ways to Lower Furnace Replacement Cost
- Replace before it fails. Planned replacements in fall or spring avoid rushed winter decisions and give you time to compare quotes.
- Right-size the unit. A heat loss calculation often allows a smaller, less expensive furnace than the old one.
- Fix ducts once. Sealing leaky ducts during replacement lets a smaller furnace do the job.
- Bundle with AC if both are old. One visit, matched equipment and shared labor.
- Ask about financing. Many homeowners spread the cost over time.
- Keep up maintenance after install. A yearly heating tune-up protects the investment.
How Long Will a New Furnace Last?
Most gas furnaces last about 15 to 20 years with yearly maintenance. Spread across that life, a higher-efficiency unit's extra cost often looks small next to fuel savings in a Massachusetts winter. See how long a furnace lasts for what extends or shortens that life. If your current furnace shows several signs it is going out, start gathering quotes now rather than in January.
How to Compare Furnace Quotes
- Was a Manual J heat loss calculation done?
- What is the exact model, AFUE and blower type?
- How will it vent, and is a liner or PVC run included?
- Are duct repairs, condensate drain and permits included?
- Is old equipment removal included?
- What are the parts and labor warranty terms?
Get a Written Furnace Estimate
Furnace replacement cost comes down to efficiency, venting, ducts and access. Typical ranges help you budget, but a site visit gives you a real number.
Jose has worked in HVAC since 2015. HomePros installs high-efficiency furnaces from Carrier and Rheem with a load calculation on every install, and hauls the old unit away. Get a free written furnace estimate, or call (781) 426-8428.