Replacing a furnace and central air system is a significant home improvement. In the United States, homeowners typically spend a broad range depending on climate, home size, ductwork, and efficiency targets. On average, a complete replacement with installation can run from about $7,000 to $15,000, though high-performance or complex setups may exceed that. Understanding the factors that drive price, the differences between furnaces and air conditioners, and cost-saving strategies helps homeowners make informed decisions without sacrificing comfort or reliability.

What Drives The Price

Several variables determine the overall cost of a new furnace and central air system. The most influential factors include system type, efficiency ratings, the condition of existing ductwork, and installation complexity. Regional labor costs and permitting requirements also play a role. In addition, the choice between a traditional air conditioner and a heat pump system changes the cost structure and long-term operating costs. Homeowners should consider both upfront expense and long-term energy savings when evaluating options.

System Type: Gas furnaces, electric furnaces, oil furnaces, central air conditioners, and heat pumps each carry different equipment and installation price ranges.
Efficiency And Features: AFUE (furnaces) and SEER/ERS (air conditioners and heat pumps) influence equipment cost. Higher efficiency often saves more energy over time but costs more upfront.
Ductwork Condition: Existing ductwork in good condition lowers costs. Damaged or poorly sized ducts may require repair or replacement, increasing labor and materials.
Home Size And Load: Larger homes require bigger equipment or multiple zones, which raises both equipment and installation costs.
Installation Complexity: Hard-to-reach spaces, smart thermostats integration, zoning systems, and new venting add to labor time and price.
Permits And Inspections: Local requirements can add to the total, especially in certain jurisdictions or new-construction-adjacent projects.
Warranties And Service Plans: Longer parts or labor warranties add value but may influence the final price.

Furnaces: Types And Costs

Gas Furnaces

Gas furnaces remain a common choice in many U.S. homes due to reliability and cost-effectiveness on heating days. The price range varies by efficiency and configuration. Standard-efficiency models (80%–85% AFUE) tend to be cheaper upfront, while high-efficiency condensing furnaces (90%–98% AFUE) cost more but offer substantial energy savings and better humidity control.

Typical installed costs:

Standard-efficiency gas furnace: equipment and installation generally around $3,000–$5,500.
High-efficiency condensing gas furnace: installed cost typically $4,000–$8,000.

Note: Oil furnaces are less common in modern homes and usually cost more to install, often in the $5,000–$9,000 range plus ongoing fuel costs. Electric furnaces are simpler and cheaper upfront but can be more expensive to operate in colder climates.

Electric Furnaces

Electric furnaces use electric resistance heating. They are typically less expensive to purchase and install than gas systems but can incur higher annual energy costs in colder regions. They may be attractive in homes without access to natural gas or where a simpler electrical upgrade is desired.

Typical installed costs: approximately $2,500–$4,500, depending on size and electrical work requirements.

Oil Furnaces

Oil furnaces are less common in newer homes but still exist in some regions. They can handle very cold climates but require ongoing fuel storage and maintenance. Installed costs are usually higher than gas or electric options, often in the $5,000–$9,000 range, plus ongoing oil costs and fuel delivery.

Modulating And Two-Stage Furnaces

Two-stage or modulating furnaces operate at partial capacity for most conditions and ramp up when demand is higher. They provide more uniform comfort and can improve efficiency, but they come with higher upfront costs. Installed prices typically fall in the mid-to-high end of the furnace range: roughly $4,000–$9,000 depending on efficiency and installation specifics.

Central Air Conditioners And Heat Pumps

Central air conditioners remove heat from the home and vent it outside, while heat pumps provide both cooling and heating by moving heat in or out of the home. Efficiency is expressed as SEER (Seasonal Energy Efficiency Ratio) for cooling performance and HSPF (Heating Seasonal Performance Factor) for heating. Higher SEER/HSPF ratings raise equipment costs but reduce energy usage year after year. A heat pump can replace a separate furnace in some homes, creating a single, efficient heating and cooling system, especially in moderate climates.

Typical installed costs:

Central air conditioner (standard efficiency, 14–16 SEER): equipment $1,600–$3,800; installed $2,000–$4,800; total installed $3,600–$8,600.
Central air conditioner (high efficiency, 17–19 SEER): equipment $2,400–$4,600; installed $3,000–$6,800; total installed $5,400–$11,400.
Heat pump (air-source, with cooling and heating): equipment $2,000–$6,000; installed $3,500–$9,500; total installed $5,500–$15,000.

Note: In some regions, ductwork upgrades or zone controls are recommended to maximize performance, adding to the overall cost. If existing ducts are undersized or leaky, sealing and balancing the system can yield significant efficiency gains.

Combined Systems: Replacing Both Furnace And Air Conditioner

When both components are replaced together, installers often offer bundled pricing that can be more economical than separate projects. A typical complete replacement for a mid-range home ranges from about $7,500 to $12,500, with higher-end configurations reaching $12,000 to $20,000 or more for advanced, variable-speed, or heat-pump-based systems. The exact total depends on the choice between gas, electric, or heat-pump solutions, as well as ductwork, zoning, and smart thermostat integrations.

Bundled systems can include:

Combined equipment for heating and cooling (furnace or heat pump with air conditioner or heat pump-only setup).
New air handler, evaporator coil, and refrigerant lines as needed.
Smart thermostat installation and optional zoning equipment.
System-specific warranties covering parts and sometimes labor.

Other Cost Considerations

Beyond the price of equipment and labor, several ancillary costs can influence the final bill. These include ductwork repairs or replacements, refrigerant re-charges or line set upgrades for heat pumps, and electrical work to support new equipment. Permitting costs, accessibility challenges, and disposal fees for old equipment also factor into the total. Homeowners should request a detailed written estimate that itemizes all components and lines of work to avoid surprises.

Ductwork And Air Distribution: Leaks or poorly designed ducts can significantly reduce comfort and efficiency, sometimes necessitating sealing, insulation, or new duct runs.
Thermostats And Smart Controls: Basic thermostats are inexpensive, but smart, Wi-Fi-enabled models and zoned systems add to the cost while improving control and comfort.
Permits And Inspections: Local codes may require electrical, gas, or mechanical permits, which add to the cost but improve safety and compliance.
Warranties And Maintenance Plans: Extended warranties and maintenance agreements add ongoing cost but can prevent unexpected repair bills.

Choosing The Right System For A Home

Selecting the optimal system involves careful evaluation of climate, home design, and energy goals. A properly sized system delivers comfort and efficiency while avoiding the pitfalls of undersized or oversized equipment. A Manual J load calculation, performed by a licensed contractor, determines the correct system size by accounting for insulation levels, window efficiency, and architectural factors. Contractors should also consider the home’s existing duct layout, the presence of zoning, and potential heat loss in attics and basements.

Key decision factors include:

Climate Zone: Colder regions benefit from robust heating capabilities, while warmer regions prioritize efficient cooling and humidity control.
System Type Compatibility: In milder climates, a high-efficiency heat pump may replace a separate furnace and AC, offering energy savings and simplified maintenance.
Energy Savings Potential: Higher SEER and AFUE ratings reduce annual energy costs, often offsetting higher upfront prices over time.
Installer Qualifications: Look for NATE-certified technicians, proper licensing, and references. Obtain multiple quotes to compare equipment, labor, and warranties.
Future-Proofing: Consider zoning, smart thermostats, humidity control, and ease of service when planning.

Cost-Saving Tips And Financing

Smart planning can reduce the total cost of a new furnace and central air system. Homeowners should explore several strategies to maximize value without compromising performance.

Get at least three written estimates to compare equipment options, labor, and timelines.
Many HVAC companies offer bundled pricing for replacing both furnace and AC, or seasonal promotions tied to holidays.
Low-interest financing or promotional APR plans can make larger upgrades more affordable and help manage cash flow.
Federal, state, and utility rebates may apply to high-efficiency equipment. The availability and amounts change; verify current programs with the contractor and the IRS or your utility.
Sealing ducts and insulating attics can dramatically improve comfort and reduce energy use, sometimes more cost-effective than a higher-priced unit.
Annual inspections, filter changes, and coil cleaning extend equipment life and sustain efficiency.

Maintenance, Longevity, And Replacement Timing

Proper maintenance extends the life of heating and cooling equipment. Typical lifespans are approximately 12–15 years for central air conditioners and 15–25 years for furnaces, though actual longevity depends on usage, climate, and maintenance habits. Heat pumps generally last about 10–15 years. A well-maintained system will run more efficiently and may require fewer major repairs. Homeowners should budget for eventual replacement aligned with the system’s condition and the improvements in efficiency and performance that new equipment offers.

Cost Comparison Summary

The table below summarizes typical installed cost ranges for common configurations. These ranges are broad to reflect regional differences, varying efficiency levels, and installation complexities. Always obtain a current, written quote from a licensed contractor for an accurate estimate.

System Type	Equipment Cost Range	Installed Cost Range	Typical Total Installed Cost	Notes
Gas Furnace (80–85% AFUE)	$800–$1,500	$1,500–$3,000	$2,300–$4,500	Lower upfront cost; consider annual operating costs.
Gas Furnace (90–98% AFUE)	$1,200–$3,000	$2,000–$5,000	$3,200–$8,000	Higher efficiency with longer-term savings.
Electric Furnace	$600–$1,500	$1,900–$2,900	$2,500–$4,500	Cheaper upfront but higher operating cost in cold climates.
Oil Furnace	$1,800–$3,000	$3,200–$6,000	$5,000–$9,000	Fuel costs variable by market.
Central A/C (14–16 SEER)	$1,000–$2,800	$2,000–$4,000	$3,600–$8,600	Moderate efficiency and cost.
Central A/C (High SEER 17–19)	$1,800–$3,800	$2,500–$5,200	$5,400–$11,400	Greater efficiency, higher upfront cost.
Heat Pump (Air-Source)	$2,000–$6,000	$3,000–$9,500	$5,500–$15,000	Heats and cools; great for moderate climates.

These figures reflect typical market ranges and are intended as planning guidance. Regional differences, contractor practices, and equipment selections can shift prices. For the most accurate planning, obtain written quotes that itemize equipment, labor, permits, ductwork, and any additional needs.