Typical Cost to Replace Furnace and AC Unit
The cost to replace furnace and ac unit ranges widely depending on system type, home size, and installation complexity. A combined furnace and central air replacement usually falls between $8,000 and $15,000, with most homeowners spending around $10,000 to $12,000 for a mid-efficiency gas furnace paired with a new air conditioner.
- Typical Cost to Replace Furnace and AC Unit
- Factors That Influence the Total Price
- System Type and Efficiency
- Home Size and Ductwork
- Installation Complexity
- Breakdown of Furnace and AC Replacement Costs
- When to Replace Both Furnace and AC Together
- Signs It Is Time for Replacement
- How to Reduce Replacement Costs
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Purchasing the units alone, without installation, typically costs between $4,000 and $8,000 for a matched system. Labor and additional materials often add $3,000 to $7,000 to the total.
Factors That Influence the Total Price
System Type and Efficiency
- Standard efficiency: Lower upfront cost, typically $6,000 to $9,000 installed.
- High-efficiency (90%+ AFUE): Higher cost, $10,000 to $15,000 installed, but lower monthly energy bills.
- Heat pump systems: Often $1,000 to $3,000 more than a traditional furnace-and-AC setup.
Home Size and Ductwork
Larger homes require higher-capacity equipment, measured in BTUs. Ductwork modifications, sealing, or full replacement can add $2,000 to $5,000 if existing ducts are undersized or damaged.
Installation Complexity
Jobs requiring structural modifications, electrical panel upgrades, or gas line relocation increase labor hours and material costs. Removing old equipment and disposing of it also factors into the final price.
Breakdown of Furnace and AC Replacement Costs
| Component | Typical Cost Range (Installed) | Notes |
|---|---|---|
| Gas furnace (mid-efficiency) | $3,500 – $6,000 | AFUE 80–90%, includes labor |
| Central air conditioner | $3,000 – $6,000 | 2–5 ton capacity, varies by SEER rating |
| Heat pump (combined system) | $7,000 – $14,000 | Higher efficiency, suitable for moderate climates |
| Ductwork modification | $2,000 – $5,000 | Only if resizing or sealing is needed |
| Electrical or gas line upgrades | $500 – $2,500 | Depends on local code requirements |
When to Replace Both Furnace and AC Together
Replacing both units at the same time often makes sense when the existing system is over 15 years old. Matching a new furnace with a new air conditioner ensures balanced performance, proper airflow, and a single warranty. Staggering replacements can lead to efficiency mismatches and higher long-term costs.
Signs It Is Time for Replacement
- Frequent repairs costing more than $500 per year.
- Rising energy bills despite regular maintenance.
- Inconsistent temperatures between rooms.
- Rust, cracks, or visible damage to the heat exchanger or cabinet.
- The system uses R-22 refrigerant, which is being phased out.
How to Reduce Replacement Costs
Obtain three detailed written quotes from licensed HVAC contractors. Ask whether the quote includes removal and disposal of the old equipment. Timing the replacement during the shoulder season (spring or fall) can sometimes lower labor costs. Check for local utility rebates and federal tax credits tied to high-efficiency models, which can offset a portion of the cost to replace furnace and ac unit.