Average Cost to Replace Furnace and AC Unit: What to Know?

Replacing a furnace and AC unit is one of the biggest investments homeowners face when it comes to comfort. A well-functioning HVAC system not only keeps your home comfortable year-round but also saves your money on energy bills and reduces the risk of breakdowns.

If your heating and cooling systems are over 12 to 15 years old or constantly needing repairs, it may be time to replace them. But how much should you expect to pay? In this guide, we’ll break down the average cost to replace a furnace and AC unit, including variations by system size, location, and specific components such as coils, compressors, and fan motors.

Average Cost to Replace Furnace and AC Unit Together

The average cost to replace both a furnace and AC unit together ranges from $7,500 to $15,000 for a standard installation. The price depends on the size of your home, system efficiency, and brand.

Homeowners often choose to replace both systems at once because:

• The furnace and AC share many components, making joint replacement more cost-effective.
  
• Installing them together ensures both units are matched for performance and efficiency.
  
• You save on labor by doing the work at the same time.

AC Unit Replacement Cost by Size

The cost of replacing just the air conditioning system varies widely based on size:

• Cost to replace 2 ton AC unit: $3,200 – $4,500
  
• For 3 ton AC unit: $4,000 – $5,800
  
• 4 ton AC unit: $4,800 – $7,000
  
• Cost to replace 5 ton AC unit: $6,000 – $9,000

Larger systems cost more due to the higher capacity, but correct sizing is critical. An oversized or undersized unit will waste energy and shorten system life.

Cost of Replacing AC Unit and Coil

If your system requires a new coil in addition to the AC unit, expect to pay extra. The cost to replace an AC unit and coil typically ranges from $2,000 to $5,000, depending on unit size and coil type.

However, the AC unit coil replacement alone cost about $600 to $2,000.

Cost to Replace AC Compressor

The compressor is the heart of your AC system, and replacing it can be costly. The average cost to replace a compressor in an AC unit is $1,200 to $2,500.

For older units, it may be smarter to replace the entire AC system instead of investing heavily in a new compressor.

AC Unit Fan Motor and Capacitor Replacement Costs

Smaller components can also fail and add to your costs:

• AC unit motor replacement cost: $400 – $1,200
  
• Cost to replace fan motor on AC unit: $500 – $1,200
  
• AC unit capacitor replacement cost: $150 – $400
  
• Cost to replace capacitor on AC unit: around $200 on average

While these repairs are cheaper than a full replacement, repeated issues may signal it’s time for a new system.

Cost to Replace Outside AC Unit

The cost to replace an outdoor AC unit (also called the condenser) usually falls between $3,000 and $6,000 depending on size and efficiency. If you’re only replacing the outside unit, make sure it’s compatible with your indoor coil and furnace to avoid efficiency issues.

Regional Differences in AC Replacement Costs

Location also impacts cost. For example, the average cost to replace an AC unit in Arizona tends to be higher because systems there are larger, higher efficiency, and work harder due to extreme heat. Expect to pay 10–20% more in regions with hot climates.

Cost of Replacing AC Unit in a Car

While most of this guide focuses on home systems, many homeowners also wonder about vehicle AC. The cost to replace an AC unit in a car averages $1,000 to $2,500, depending on the make and model.

Should You Replace Furnace and AC at the Same Time?

If both your furnace and AC are old, it usually makes sense to replace them together. The cost to replace the AC unit and furnace is higher upfront, but you’ll save on labor, improve energy efficiency, and ensure system compatibility.

Ways to Save on AC and Furnace Replacement

• Get multiple quotes from licensed HVAC contractors.
  
• Consider mid-efficiency models if you don’t plan to stay long-term.
  
• Ask about rebates or financing options.
  
• Replace both systems together to save on labor.

Why Choose Us

At United State Solutions, we know that replacing a furnace and AC unit is a big investment, and you deserve a partner you can trust. Our team offers transparent pricing, expert installation, and high-quality systems designed for long-term efficiency. 

Unlike many contractors, we don’t just sell you equipment, we take the time to evaluate your home’s needs, recommend the right-sized system, and provide honest options that fit your budget. With flexible financing, seasonal specials, and a reputation for reliable service, we make the replacement process stress-free from start to finish. 

Therefore, choosing United State Solutions means you get comfort, efficiency, and peace of mind backed by professionals who care about your home as much as you do.

FAQs

Is it worth replacing the compressor instead of the whole unit?

If your unit is less than 10 years old, replacing the compressor (around $1,200–$2,500) may make sense. For older units, a full replacement is usually a better long-term investment.

How often should I replace my AC unit?

Most AC units last 12 to 15 years. If your system is older, inefficient, or requires frequent costly repairs, replacement is recommended.

What is the cost to replace the capacitor on the AC unit?

The cost to replace the capacitor on an AC unit averages around $200, making it one of the less expensive repairs.

How much does a 3-ton AC unit replacement cost?

The 3 ton AC unit replacement cost is typically $4,000 to $5,800, depending on brand and efficiency rating.

Can I replace just the outside AC unit?

Yes, but the cost to replace an outside AC unit runs $3,000 to $6,000. It must be compatible with your indoor coil and furnace, otherwise efficiency drops significantly.

Final Thoughts

The average cost to replace a furnace and AC unit depends on many factors including size, efficiency, and region, but most homeowners spend between $7,500 and $15,000 for a full system replacement. Individual components like coils, compressors, and motors have their own replacement costs, but in many cases, investing in a new system is more cost-effective in the long run.

At United State Solutions, we provide honest assessments, expert installation, and financing options to help homeowners find the right system at the right price. If your furnace and AC are nearing the end of their lifespan, now is the best time to plan ahead and ensure your comfort for years to come.