The price to install a new furnace and central air conditioning (AC) unit in the United States varies widely based on system type, efficiency, home size, ductwork, and local labor rates. Understanding the main cost drivers helps homeowners budget accurately and avoid surprises. This guide breaks down typical costs, what affects price, and smart ways to plan a cost-effective installation that delivers reliable heating and cooling for years to come.

Factors That Influence Installation Costs

Several core factors determine the final installed price. The type of furnace (gas, electric, or oil), the cooling system configuration, and the efficiency ratings (AFUE for furnaces and SEER for AC units) have the largest impact. The size of the home and the required BTUs influence unit selection and labor time. Existing ductwork, the need for duct sealing or new runs, and the complexity of the installation also matter. Local labor rates and permit requirements can add or subtract thousands of dollars. Finally, additional upgrades like smart thermostats or air-quality accessories can push costs higher.

Homeowners should consider the long-term energy savings from higher efficiency. While a high-efficiency unit costs more upfront, it often reduces monthly utility bills and qualifies for tax credits or rebates in some markets. Budget planning should balance upfront investment with expected energy savings over the system’s life.

Average Price Range In The United States

Prices vary by region and system type, but typical installed ranges are as follows. These figures assume a standard two-zone, single-family home with existing, functional ductwork and no major structural changes.

Furnace installation (gas, mid-range efficiency): $3,000–$7,000
Central air conditioning installation (gas furnace paired with AC): $3,500–$7,800
Combined furnace and central AC installation: $6,500–$14,000
High-efficiency or premium systems (higher AFUE and SEER, variable-speed or modulating units): $7,500–$20,000+ for the whole package
Simple or economy options with basic efficiency: $4,000–$8,000 total

Note: In some markets, ductwork improvements, zoning, or retrofits can push totals higher. Always request a written estimate that itemizes equipment, labor, ductwork, permits, and any add-ons.

Furnace Types And Their Costs

Choosing the right furnace significantly influences installed price and long-term operating costs. The main options are gas furnaces and electric furnaces, with additional sub-types that affect efficiency and upfront price.

Gas Furnaces

Gas furnaces are common for homes with natural gas service. They typically cost more to install than electric units due to venting requirements and fuel conversion considerations. Installation often ranges from $3,000 to $7,500, depending on AFUE, brand, and whether new ductwork is needed. High-efficiency models with multi-stage operation can push costs toward the upper end.

Electric Furnaces

Electric furnaces (resistive electric heating) generally have lower upfront costs than gas but higher operating costs in many regions. Installed prices usually fall around $2,500–$5,500, making them a budget option in areas with high electricity prices or limited gas service. They are often paired with electric AC or heat pumps rather than fossil-fuel systems.

High-Efficiency And Modulating Furnaces

High-efficiency models, including modulating and two-stage furnaces, use advanced technology to heat more evenly and reduce energy waste. Installed costs for these units typically range from $5,000 to $9,000 for the furnace alone and higher when combined with a new or upgraded duct system. They often qualify for energy credits and rebates, depending on location and eligibility.

AC Unit Types And Their Costs

Air conditioning options range from traditional central AC to high-efficiency or air-source heat pump configurations. The cost to install the cooling side depends on efficiency, size, and whether compatible indoor components are already in place.

Central Air Conditioners

Standard central air conditioners, paired with a furnace or air handler, typically cost between $3,500 and $7,800 for installation. Higher-efficiency compressors, variable-speed blowers, and better warranties push price toward the top of this range. A full system upgrade, including new ducts or repairs, can increase total costs.

Air-Source Heat Pumps

While not a traditional furnace, air-source heat pumps provide both cooling and heating. They’re common in milder climates but increasingly used nationwide. Installed prices generally run from $4,000 to $12,000, depending on climate, efficiency (SEER), and whether a traditional furnace remains in place for backup heat.

High-Efficiency And Variable-Speed AC Units

Higher-SEER (efficiency) and variable-speed compressors offer improved comfort and lower energy use. These units commonly range from $4,500 to $9,000 for the cooling portion alone, with installation complexity adding to the final bill if ductwork or controls require upgrades.

Labor Costs, Permits, And Ductwork

Labor is a major component of total installed cost. Typical projects take one to three days, depending on system complexity, existing ducts, and whether new gas lines or electrical work is required. Permits can range from $50 to several hundred dollars, depending on the city and permit type. Ductwork evaluation, sealing, and optional upgrades, such as new ductboard or sheet metal, can add $1,000–$4,000 or more to the job.

Proper duct sealing improves efficiency and reduces airflow losses. Some homes need retrofit ductwork to balance airflow, especially with new high-efficiency furnaces or when converting to a heat pump. These adjustments are essential for performance and can affect overall cost significantly.

Energy Efficiency And Long-Term Savings

Efficiency ratings influence both upfront price and ongoing energy costs. AFUE (Annual Fuel Utilization Efficiency) indicates how effectively a furnace converts fuel into heat. SEER (Seasonal Energy Efficiency Ratio) measures cooling efficiency. Higher ratings typically raise upfront costs but reduce monthly bills over the system’s life.

Homes with modern, high-efficiency equipment often enjoy better comfort and fewer maintenance issues. In some markets, upgrades to ducts, insulation, and air sealing are part of the installation and contribute to long-term savings. Tax credits and utility rebates may further offset upfront costs for eligible equipment and home improvements.

Financing Options And Warranties

Many contractors offer financing plans to spread the cost over time, with options ranging from promotional 0% APR periods to longer-term loans. Compare total costs and any maintenance agreements. Warranties typically cover the unit for 5–10 years, with separate warranties on parts and sometimes limited labor coverage. Some installers offer extended warranties for a surcharge. Reading warranty terms is essential to understand coverage for failures, refrigerant leaks, and compressor damage.

During discussions, ask about coverage for labor, refrigerant charges, and whether warranty transfers to new homeowners if you sell the house. A strong warranty can add peace of mind and protect the investment against unexpected repair bills.

Seasonal Timing And Scheduling

Timing can influence price and availability. Scheduling in spring or fall, outside peak demand months, can yield lower installation costs and shorter wait times. Peak heat or cold waves often drive up pricing due to higher demand for service crews. Homeowners with flexible timelines may negotiate best pricing by planning ahead and obtaining multiple written estimates.

Some contractors offer bundled promotions, especially when replacing both furnace and AC together. Look for seasonal specials, financing offers, or discounts on maintenance plans that pair with installation to maximize value.

Common Add-Ons And Upgrades

There are several popular add-ons that improve comfort, air quality, and efficiency. These can increase upfront costs but may offer long-term benefits or tax incentives. Examples include:

Smart thermostats for precise climate control and energy scheduling
Air purifiers or high-MERV filter systems for improved indoor air quality
Whole-house humidifiers or dehumidifiers for humidity control
Zoning systems to control temperatures by area or floor
Air sealing and insulation improvements to reduce heat gain and loss

Before adding upgrades, homeowners should evaluate your home’s needs, climate, and budget. Some upgrades pair well with high-efficiency systems to maximize return on investment.

Cost Comparison: New Installation Vs Replacement

New installation refers to a full system upgrade with a new furnace and AC unit, possibly including ductwork and controls. Replacement typically means swapping out one or both components without changing the building’s structure. In most cases, a full system replacement costs more upfront but offers long-term benefits in efficiency and comfort. If ductwork is still in good condition, replacing only the inefficient components can be a cost-effective path. However, upgrading to matching, newer technology often yields better performance and energy savings over time.

DIY Vs Professional Installation: Why It Matters

Installing a furnace and AC system is complex and involves critical safety considerations. A professional installation ensures proper sizing, venting, electrical connections, refrigerant handling, and code compliance. Improper installation can lead to safety risks, poor performance, higher energy bills, and voided warranties. For these reasons, most homeowners should hire licensed HVAC technicians for the project. If a homeowner is technically skilled, some preparatory tasks like space clearing or minor cleanup can be done, but the installation itself should be left to professionals.

In summary, the cost to install a new furnace and AC unit in the United States ranges widely based on system type, efficiency, home size, ductwork needs, and local labor rates. Homeowners should pursue multiple, detailed estimates, compare efficiency ratings, consider potential tax credits, and plan for future upgrades that improve comfort and energy savings. A well-chosen system delivers reliable heating and cooling, reduces energy costs, and enhances home value for years to come.