How much does it cost to replace an entire AC system?
Replacing an entire air conditioning system typically costs between $3,500 and $12,000 in the United States, with higher-end configurations or extensive ductwork pushing totals beyond $15,000.
The final price depends on whether you’re swapping a central system with an outdoor unit and indoor air handler and existing ducts, or installing a ductless mini-split or a completely new ducted setup. Key variables include system size (tons), SEER rating, whether you need new or repaired ductwork, refrigerant type and charges, installation difficulty, and local labor and permitting costs.
Cost drivers
Costs are driven by the components, labor, and permitting involved in a full replacement. The list below explains the main factors you’ll encounter.
- Equipment costs: condenser unit, air handler/evaporator coil, or a heat-pump unit; higher efficiency or advanced technology increases price.
- Labor and installation: site preparation, refrigerant handling, electrical work, system charging, and tests can vary by region.
- Ductwork and ventilation: existing ducts may need sealing, insulation, sizing, or replacement; new ducts significantly raise cost.
- Controls and thermostat: standard programmable thermostats are cheaper; smart or learning thermostats add cost but can save energy.
- Permits and inspections: local requirements can add hundreds of dollars to the project.
- Disposal and refrigerant removal: safe disposal of old equipment and refrigerant has a fee.
- Additional features: zoning, enhanced filtration, humidity control, or advanced compressor technology.
- Refrigerant considerations: older systems may use R-22, which can raise costs due to availability and handling rules; newer systems typically use R-410A.
Across these variables, a typical central air replacement with existing ductwork usually lands in the $3,500 to $7,500 range, while projects involving new or extensive ductwork, high-efficiency systems, or multi-zone installations can climb toward $10,000 to $15,000 or more.
Typical price ranges by setup
Prices vary by system type and home specifics. The ranges below reflect common installations as of 2024–2025.
- Central air replacement with existing ductwork: generally $3,500–$7,500.
- Central air replacement requiring ductwork modification or new ducts: typically $6,000–$12,000.
- Ductless mini-split systems (per zone): about $3,000–$8,000 per zone; a multi-zone (3–4 zones) home could be $9,000–$25,000.
- High-end or multi-zone/heat-pump configurations: often $8,000–$15,000+ for single-zone to multi-zone setups.
Note that ductless systems and multi-zone configurations can vary widely depending on the number of zones, outdoor units required, and installation complexity.
Saving money and planning ahead
Before planning a replacement, homeowners should consider strategies to balance upfront costs with long-term savings and comfort. The following tips help you shop wisely and avoid surprises.
- Get multiple written quotes that itemize equipment, labor, ductwork, permits, and disposal.
- Choose an appropriately sized system for your home; oversizing or undersizing can increase upfront costs and reduce efficiency.
- Prioritize the right SEER rating for your climate; higher efficiency can lower operating costs over time.
- Assess whether upgrading ducts or sealing and insulating existing ducts will improve performance and reduce energy use.
- Look for manufacturer rebates, utility incentives, and any available financing options.
- Ask about warranties on equipment and labor, and plan for routine maintenance to extend the system’s life.
With careful planning and professional guidance, most homeowners can find a solution that meets both budget and comfort needs while maximizing energy efficiency.
Summary
Replacing an entire AC system is a major home improvement with costs that vary widely based on the system type, ductwork needs, and efficiency goals. Central replacements with existing ducts tend to land in the mid-range, while new ducts, multi-zone setups, and high-efficiency models push into the higher end. Ductless options offer flexibility but can scale up quickly with the number of zones. Always obtain several written quotes, clarify what’s included, and consider long-term energy savings and warranties when making a decision.
